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1.
I gathered some facts about them:

Ninja don't sweat.

Bullets can't kill a ninja.

Ninja invented skateboarding

Only a ninja can kill a ninja. Regular humans are useless.

Ninja never wear headbands with the word "ninja" printed on them.

Ninja can breath underwater anytime they want.

Ninja can change clothes in less than 1 second.

Ninja don't smoke, but they do use smoke bombs.

Ninja always land on their feet. If they don't have feet they will land on their nubs.

Ninja invented the internet.

Ninja don't eat or drink very much, and they never have to go to the bathroom.

Ninja always move to America when making a new start as a non-assassin.

Ninja don't play sports. Unless killing is a sport.

Ninja can crush golfballs with 2 fingers, any two fingers.

Ninja have a bad temper when they lose at anything. They will usually cut off the winners head before they have time to gloat.

Ninja lie all the time. Even when the truth serves better, ninja will lie anyway.

Ninja swords are always straight with a square handle guard. Always. Curves are for girls.

Lack any personality

Wear headbands

Fight skillfully with any object

Can remove a spleen in one swift motion

Live in your house secretly for days

Can remove their shadow if needed

Hurl shurikens

Go anywhere they want instantly

Catch bullets in their teeth

Kill themselves if they make a noise

Can run 100 miles on their hands

Train 20 hours/day starting from age 2

Have cool words like Seppuku

Are masters of disguise

Can hover for hours

Flip out and kill everything

Are completely self-sufficient.

Split planks vertically with their nose

Can hide in incense smoke

Kill people.

Ninjas are the best guitar players. Ever.

Ninjas do NOT wear spandex.

A Samurai is NOT a ninja.

Dragon Ball Z characters are NOT ninjas.

If you see a ninja, he is NOT a ninja.
Some guy: "Ninjas are totally sweet"
Some other guy: "True true"
by sam paulin August 12, 2005
 
50.
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
 
51.
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
 
52.
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
 
53.
A word similar to nigga but for Asians.
Azn1: What's good Ninja?
Azn2: Nothing much my ninja.

or...

Black guy: What's good my Asian nigga?
Azn: Burning trees ninja.
by Deflecto December 29, 2010
 
54.
1) Ninja (vt) To kick ass, synonems : own, kick ass, pwn, frindle. (past = ninjaed
2) Ninja (adj) awsome, badass, etc., only more so
3) Ninja (n) a) One who is ninja

b) one who ninjas people

c) An ancient Japanese assasin
Related - Pirate - one who is awseome, but not as awesome as a ninja.

- Pirate - One who is not at all awesome
1) Dude, I totally ninjaed him.
Ninjaed!

2) That dude is so ninja.

3) a) I am a ninja!

b) That ninja ninjatically ninjaed that pirate!

c) The ninja, objecting to being used as a verb, assasinated the users of this website.
by Draxis December 06, 2010
 
55.
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
 
56.
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