A Transmitted Disease Which Is Acquired By Either Having Sex Or Getting In Contact With An Infected Persons Blood aka The Ninja
Brian: Dude Help!
Angelo:What's Wrong?
Brian: I Don't Know Man, I Just Slept With Melanie!!!
Angelo: Dude I Think You Just Got The Ninja!!!
Brian: Dude I Can't Feel My Dick!!!
Angelo: Its A Good Thing I These Got Ninja Proof Condoms At Walmart For 7.99.
by Ibetatestedyourmother November 30, 2007
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Facts (100% True):

-It only takes 1 ninja to screw 1,000,000,000,000 lightbulbs. and a similar amount of girls
-you can't see a ninja until it's too late
-ninjas can tell if a movie is good by looking at the cover
-The n word was a mispronunciation of ninja
-ninjas can beat mimes in the silence game
-a ninja always wins, otherwise they are not ninja
-ninjas don't touch the ground because it is afraid of ninjas
-infinity is just another term ninjas use to count their kills
-ninjas don't wear clothes, that is just their natural camoflauge
-ninja is the explanation for everything
-ninjas can swim on land
"Did you see that ninja-....?" (abrupt pause and silence).
by ~MR.D~ January 12, 2011
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Due to the fact we could not find any ninjas, we can not define them. We hope our apology is accepted. (But not by ninjas, for they never forgive, and they NEVER forget.)
That ninja is a great ninja, for we do not know what, who, or where it is.
by IfITellTheNinjasWillKillMe November 30, 2009
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1.) verb: to take something that rightfully belongs to someone else, mostly in MMORPGs, such as wow; to steal
2.) noun: a player who practices ninja-ing against other players.
1.) "That jerk ninja'd the Assassination Blade, even though I won the roll!"
2.) "Don't group with that guy, he's a ninja looter!"
by Beleynn September 13, 2005
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n. pl. ninja or nin·jas or nin·jaed

One who takes loot before a group has made their decision. Typically greedy players and should not be trusted.
OMGWTF, someone just ninjaed Destiny in our UBRS raid!
by Tsurani August 11, 2005
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1.
Noun;

a highly skilled assassin. It is widely accepted that ninjas are capable of literally melting into surfaces where the shadow is sufficient.
It is generally uncontested that a ninja is fully capable of killing you in the center of a social event without being seen, heard, or witnessed in any way by your senses. Hell, he'll probably be gone before you hit the damn floor.

2.
Adjective; to describe an act of extreme skill or stealth.

2.
Verb; an act of extreme skill or stealth. Usually used as a hyperbole, because nobody knows exactly how a ninja works, as normal people have yet to see it in action.
1.
"Wanna watch Naruto with me? He's a really cool ninja."
"No, no, you got it wrong. Naturo is a pussy, not a ninja."

2.
"Gentlemen! We just seized an airfield.
...That was pretty fucking ninja."

3.
"I just totally ninja'd that fool!"
"I concur. Ninja'd that fool you did."
by Pencil Vania April 28, 2010
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Mammals who fight all the time and whose sole purpose in life is to flip out and kill people.

Natural predators with only one enemy in nature, namely Pirates.
by dragonxero February 25, 2005
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