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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.
ninja by Kankokujin May 25, 2005
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Ninja Egg Roll USA (NERUSA)

a worldwide overnight sensation that crumbles under the weight of its hitherto unimaginable awesomeness only to rise from the ashes phoenix-like to reclaim its rightful place in world history.

Derived from the all-girl punk/pop/thasher band of the same name, best known for Blangie 2000:World Tour and "The Limo Flew Out of My Eye (Crying Limousine Tears)"
"It might look bleak now but if all goes well we might just pull a NERUSA"

ninja fap 

Its when you secretly beat off for someone else to find later.
"Every morning I ninja fap in the shower. And my dad thinks thats soap between his toes."
ninja fap by dave_dew January 21, 2007

apartment ninja

One who steps lightly on the floor in a second/third story apartment.

One who sneaks into the neighbor's apartment through the patio door.
1. Dude, I had to be an "apartment ninja" just to go to the bathroom becuase the old lady downstairs likes to yell at me for noises...

2. Dude I think I just got owned by an "Apartment Ninja" because that's the third time my internet was on when I came home.
apartment ninja by !Z3D! August 4, 2008
Word of the Day on January 13, 2013

ninja turtle

When you have a very sudden and extreme need to use a toilet.

Derived from "turtle head poking out".

Denoting an unexpected, well-armed and violent turtle, a pissed-off Raphael in your stomach if you will.
A: Wow honey, that was some delicious curry and black coffee. Those green peppers sure were hot!

B: Yeah... *clutching stomach*

A: You look green. Are you okay?

B: No, I've got a ninja turtle in here. *pointing to stomach* Be right back.
ninja turtle by remote Erik June 25, 2008
A substitute word for the N-word.
Ninja by John Smuggy January 11, 2010
The darkest, the craziest, the most ninja of all ninjas to live. Foluké, he would round house kick you from Reading to China. He invented the round house kick and other ninjas stole it like Bruce Lee and Chuck Noris, these guys have nothing on Foluké.
Shit! Can you see that?
See what?
Its that Ninja! He calls himself Foluké
Oh yeh! What a bad ass mother fucker!
Ninja by Macaroon 555 May 1, 2010