1. (v) To perform something dastardly and underhanded.

2. (v) To steal.

3. (v) To shirk or sneak away from something.

4. (v) To hide.

5. (v) To kill someone in a silent manner.

6. (v) In MMORPGs, to pick up a dropped item that your character does not need and refuse to give it to someone in your party who is more in need, just for the hell of it.

7. (n) In modern US military slang, any member of a Special Forces group that is primarily involved in recon, sabotage or rescue going deep into enemy territory. This is rarely used, but common when referring to a Special Forces operative who is wearing what is also dubbed a "ninja suit" - a pair of matte black BDUs, usually with some face paint to go with it.

8. (n) A grossly misunderstood historical occupation, skewed by comic books and movies. The ninja was the ultimate pragmatist - lofty codes of honor and ritual suicide did not apply at all to him. They were highly adaptive, extremely physically fit and intelligent - taijutsu, or hand to hand combat, is only part of the entire science and art that is ninjutsu. The ninja also learned how to camoflague, fake accents, act, craft disguises, chemistry (for creating bombs and devices), various kinds of weapons training, wilderness survival, escaping all sorts of prisons and traps, building traps and much more. Young children were scouted and adopted into ninja clans at a very young age, typically around six to eight, if came across a need to swell ranks. While taijustsu was a small part of ninjutsu, it was nonetheless very practical and very comprehensive. A valid taijutsu system will have striking, grappling, joint locking and proper breathing exercises.

Everything that would benefit them, they would learn and assimilate. Indeed, as soon as Western firearms became available through a Chnese junk ship and the Japanese began to produce their own domestic arquebusiers and muskets, the ninja incorporated them. The stories of ninja using pistols and muskets are legion. To this day, modern ninjutsu-ryus such as Tokage-ryu (Who's headquarters is the Honbu Dojo and, very sadly, is devoured in controversy at the moment. The Grandmaster and all his senior students were all killed in a car accident while they were on a mountain trip. Much of the advanced teachings may be lost.) incorporate modern firearms training, mainly semiautomatic pistols and rifles.

Mythology built up around the legendary strength, agility, resourcefulness and even magic. Kunai and shuriken were made to distract and disable, not kill. The shuriken itself is designed so that it saws at the target, then flies off, NOT stick into his flesh. This coupled with the glint of the metal shuriken at night and no apparent evidence left on its target led people to create many myths about the ninja, like the ability of them to shoot lightning from their hands. The ninja meditation and Buddhist seals were taken as precursors of magical spells. Their ability to squeeze out of any amount of roping and vanish in solid steel bar cages served only to ignite the wild imaginations of rumor-spreaders, and the ability to stay still for days.

Another popular myth is that the ninja's primary job was as an assassin. This could not be any further from the truth. The ninja were used as spies, reconnaisance, sabotage and information gathering. In fact, no ninja assassinations have ever been recorded in history. We can any make vague guesses and assumptions, but the evidence that they worked primarily to gather information is staggering compared to the guesswork of figuring out who they might have killed.

The black ninja dogi also highly perpetuated in movies likely myth as well. The ninja would typically disguise himself as a peasant, merchant or samurai. If they did wear anything like what you see in the movies, it was probably a dark brown to match forests or a dark blue, since pitch black sticks out in even the blackest of night. But most likely, they probably just rubbed dirt or debris on themselves to break up their figure. Afterall, it'd be terribly suspicious if some guards found you sneaking around a castle dressed in an all black catsuit. Indeed, the records of ninjas fighting in organized military battles hold much more evidence than them carrying out separated individual assassinations.
1. Dan left to go to the bathroom, so I ninjaed an entire bottle of tabasco sauce into his Kool Aid.

2. I remember in third grade when me and Rob went to 7-11 after school, he ninjaed six candy bars when the clerk was pulling money out of the cash machine.

3. I don't feel like taking out the garbage. I'm gonna ninja out the window and hang out with my buddies.

4. Oh shit! Cops! Quick, hide the eggs! I'm gonna ninja in those bushes!

5. Last night in CounterStrike, Ron was crouching by the door in the bomb site. When the terrorist ran by he ninjaed him with a knife.

6. That little fuckface just ninjaed that Mantle of the Psychic Champion! And he's a fucking Barbarian!

7. Jesee's dad used to be a Navy SEAL ninja. He doesn't really talk about it, but there are some pictures of him with his graduating class in ninja suits after a training exercise.

8. Hattori Hanzo, also known as Masashige, was a very famous ninja. He was the jounin (Clan Leader) of the Iga Clan, and served the shogun Tokugawa Ieyasu very loyally. He fought his first battle at 16, and went on to serve at the battles of Anegawa and Mikatagahara. He was nicknamed as 'Devil Hanzo' not only for his prowess, but also to distinguish him from another Tokugawa ninja, Watanabe Hanzo.

His successor and son Masanari was given the title Iwami-no-Kami, and his men became the guards of Edo Castle. Hanzo's reputation as a jounin who commanded a 200-man strong unit of Iga ninja grew to legendary proportions.
by Kankokujin May 13, 2005
Practitioner of a martial art developed as a means of countering Samurai military power and monopoly of single-edged swords. Erroneously thought by many to have evolved in Japan. Revealed in "Batman Begins" to actually be practiced way up in the mountains in Tibet, thus rendering Ninjas safe from any surprise attacks from the Samurai, who did not live in China.
Hello Bruce Wayne! I am an Irish Ninja living in the Himalayas, and I am here to teach you to be Batman!

WTF? You aren't going to burn down dad's mansion, are you, you crazy lamestain?
by Juan Non-lamestain August 01, 2008
plural for ninja.
by AYB April 02, 2003
someone who is using the perk "ninja", or "ninja pro" in "Call of Duty: Modern Warfare II".
In a free for all

Ninja:

"Ooh I'm gonna sneak up on Erik B Red, and kill his ass...Bam!!!! How you like them apples?!?!?!"

Me(with a heartbeat sensor):

"Damn ninjas!!!!! I'm gonna kill you ninja!!!!"
by Erik-B March 12, 2010
An assassin that according to the show 'deadliest warrior' can get totally owned by a Spartan.
Hey did you see that spartan kill that ninja?
by Dudewhereismycar? April 30, 2009
An unending game involving more than one participant. The objective of ninja is simple. Fart in your hand, sneak up behind the unsuspecting victim, then cover both their nose and mouth in attempt to "assassinate" them. Ninja can start at any time. There are no rules or restrictions to your assassination attempts, but they must be carried out in the fashion mentioned above. The game will end when the other party specifically expresses they want to quit the game. (If they know what the game is.) Or if they gag or excrete any type of bile. If none of these are met, then the came will continue until then.
Me and bob were hanging out in the kitchen one night, until I farted in my hand while he was busy and cuffed his mouth and nose in attempt to assassinate him like a Ninja.
by Jack wangerdoodle. February 21, 2014
They were masters of Ninjutsu(The Art Of Stealth) the martial art of the ninja NOT Kung Fu. For those who can't tell the difference between samurais and ninjas a Samurai is more like a soldier without guns but armed with Swords,Bows and arrows But Ninjas or Shinobi is more like a guerrilla squad using Swords, Shuriken, Smoke Bombs, etc. Everything that people believe in like how ninjas can do anything like run on water, make some hand seal and turn in to smoke and how people think ninjas are demons that kill people for no reason were wrong. The science of ninjas were higher and that's why they thought Ninjas were Magicians but they were only illusionist who fooled the eyes of the ignorant. Even the military uses the ninjas tactics and weapons like smoke grenades originally came from smoke bomb. Samurai described ninjas from there experience from battles then later people made up stories like how a ninja summoned a Giant Frog to Defeat it. Later on Masashi Kishimoto created Naruto the anime cartoon episodes as seen in cartoon network based on Japanese folk stories. Ninjutsu contained Pressure points, Samurai Sword Techniques, Chinese Philosophies,Meditation,etc.
The code of the ninja(Ninpo) which was was against the code of the samurai (Bushido). The art of the Samurai was death. But the art of the ninja was to survive, get the job done and escape. This gave ninjas greater advantage. They also borrowed stealth tactics from Sun Tzu the Chinese general.
Example:
-Be extremely subtle, even to the point of formlessness. Be extremely mysterious, even to the point of soundlessness. Thereby you can be the director of the opponent's fate.

-For to win one hundred victories in one hundred battles is not the acme of skill. To subdue the enemy without fighting is the acme of skill.

-Invincibility lies in the defence; the possibility of victory in the attack.

these were all ninja tactics
by @@@@@@@ October 10, 2011
Someone who has the ability to mindfuck others. Someone who is stealth enough to complete missions with other ninjas that involve high risk situations. A ninja can usually "ninja" information out of other individuals who are clear 'un-ninjas'.

Ninjas are usually dressed casually, and people don't usually peg these people as actual ninjas, but rather, ordinary and normal girls. Watch out though, there couldbe a ninja at your workplace.

And she could ninja the shit out of you.
co-worker: blah blah blah blah blah

ninja: (in her mind) - good to know I just ninja'd the shit outta you bud. I'm going to go tell my other ninja this classified information.
by ninjatwoxo July 21, 2011

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