1)sudden dissapearance
2) quick movement from one area to another
i was at the store and tom totally ninja'd on me.
by nickers May 19, 2005
When a Nerd playing World of Warcraft, steals an item that he has no apparent use for and his group member needed it.
He just took my epic sword and he cant even use it. He ninja'd my sword!!!
by Dwnsdr3 March 02, 2010
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)
by Pruney The Transvestite January 15, 2010
after sexual intercourse the act of walking across the room taking off the condom and quickly spinning around and throwing said condom at the woman's face like a shruiken
I totally Ninja'd that ho last night!
by Jeffery Harrison Nancy November 02, 2007
to be extremely high yet act so sober that no one was able to tell the difference.
Kevan ninja'd everyone at the party last night.
by Lil Matt 88 September 17, 2008

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