A new tactic the the FPS Xbox 360 game, Halo 3. A Player lures another player into following them. Player 2 is following player 1. Player 1 goes around a corner. Player 2 Follows. Player 1 jumps backwards, and Player 2 passes under Player 1. Player 1 Melee's Player 2 and instantly dies due to an assassination. Ergo, Ninja'd.
by THISxGuy March 09, 2010
the act of doing something successfully in a stealthy manner & when exiting the scene, you say "Ninja" in a spooky tone to rattle other people in the area who didn't realize wtf was going on.
by L0Lpants July 20, 2011
When a Nerd playing World of Warcraft, steals an item that he has no apparent use for and his group member needed it.
by Dwnsdr3 March 03, 2010
by Lil Matt 88 September 17, 2008
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)
Charlie: Holy crap man those were ninja'd off you about a good 3 hours ago!
tommy: awwwwww mannnn!
(cue laugh track)
by Pruney The Transvestite January 15, 2010
by AwfulDarkJedi May 30, 2009
(verb) to mess with a member of the opposite sex's head, usually by women. Originates from the comedy routine of comedian Dane Cook.
by strongbadia7 November 14, 2007