ninja 

to be extremely skilled at something, to have a lot of useless skills that won't help you at life

Did you see that one guy on tv? He was so ninja at cracking 67 eggs in one minute.

ninja by ec0fr3ind1y May 6, 2009

Ninja-Justin Drew Bieber-Mallette 

a cheating lying douche-bag that doesn't deserve to be alive.

You're such a Ninja-Justin Drew Bieber-Mallette

Ninja-Justin Drew Bieber-Mallette by smdbish April 20, 2011

American Ninja 

A common stereotype in western cinema. As opposed to Japanese ninja, an American one will perpetuate the general attitude toward far eastern culture with high-pitched screaming and ridiculously flashy moves, and should a plot require it, an intense one-on-one katana showdown in broad daylight. Will also wear a black bodysuit no matter what the lighting conditions or scenery are. Completely contradicts the entire point of the ninja in the first place, which is to assassinate in complete and total secrecy.

Bruce Lee comes to America, acts, and all of a sudden every Asian on the planet fights like him; thus was born the American Ninja.

American Ninja by Stefan-sama November 19, 2010

ninja 

Someone who is a mistress to a man while he is in a relationship with another woman.

Yo, that is my ninja over there talking to my girlfriend.

ninja by LaTrice March 23, 2007

ninja'd 

When someone takes something or someone away from you and you did not know whats the fuck is going on until the person ninja'ding you is laughing his/her/ ass off. The term ninja'd is usually mixed up with thiefed but the stupid sob that did that is spread across the atlantic ocean....Right now.

Tommy: Hey broski wheres my pencil....and my pants?

Charlie: Holy crap man those were ninja'd off you about a good 3 hours ago!

tommy: awwwwww mannnn!

(cue laugh track)

ninja'd by Pruney The Transvestite January 17, 2010

ninja 

take chuck norris joke and replace chuck norris with ninja

Chuck norris can divide by 0
=
Ninjas can divide by 0

ninja by ninja dood January 7, 2009

Shit ninja 

what douchebag video game nerds call you when they cant think of anything else to say.

video game nerd: why did you trip me down the stairs jackass?

me: fight me?

video game nerd: you know what! YOUR A SHIT NINJA!

Shit ninja by Grantino November 17, 2007