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 12, 2005
A non-word used by people who don't know that:
1. There are no plurals in Japanese and
2. Pluralizing Japanese nouns makes them sound like verbs.
Wrong: Ninjas are always fighting.

Right: There are about 8 ninja surrounding us.
by Zhaleskra March 10, 2007
A word used to avoid using the word nigga.
WTF are they doing, them ninjas is crazy!
by LittleDintheD April 01, 2007
Ancient Japanese warrior, well trained in the art of stealth. Some tools of the trade include shuriken, swords, daggers, and knives. Ninja were part of a clan.
"This isn't Teenage Mutant Ninja Turtles!"
by Mad Walrus September 21, 2002
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.
"Holy crap, that ninja is sooo freaking sweet!"
by dragonxero February 25, 2005

Basically another word for cool. Except cooler, as its the word Ninja. Similar to badass in defintion yet far more badass, i think the best explanation of this word is infact 'Ninja'.

This is going to happen. It's Inevitable. It's going to happen big.

It will grow and spread across the Internet like wild fire with a shuriken.
*Roundhouse Kicks someone through a wall*
"Woah that's so frickin' Ninja!"

*A very nice hat*
"That hat is so Ninja!"

*Walks on the grass when there is blatantly a sign with clear instructions not to*
"Shit, that dude is ninja."

*Prefers Pirates*
"What a queer"
by ThatNinjaguy November 14, 2009
v. the act of stealing, swooping, or snaking something. usually the person who has been ninja'd upon does not realize it for a little while, and then they are mad when they find out that something of theirs has been ninja'd.
Hey man you ninja'd my chair. Why the hell did you ninja my book, Jordan?
by CPepe September 20, 2005

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