To have sex, usually very quietly and in a fashion that will avoid detection. From the phrase "Ninja that bitch."
Most often heard in the gerund form "ninjing".
Yo, no ninjing on the mountain!
by Fern, Defender of Trees July 16, 2009

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Top Definition
To do in the fashion of a ninja.
I'm ninjing like a pro, baby!
by Cath arsis June 03, 2004

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ninj (v.): to act in such a manner that could be construed as causing trickery, disruption, and/or pain on those who instill one's wrath
Ninj (n.): any one of a number of people who enjoy, and in fact take delight in, causing mischief and trickery on those who deserve it; i.e., mauling someone
v. "I'm gonna ninj you, you bloody prick, if you ever say something like that again!"

n. "I am so a ninj!"
by ninjgirl April 13, 2011

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to act like or immitate a ninja
im a ninja i ninj things
by reeding February 05, 2008

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anything you want it to mean fitting the situation.
Damn you ninjed up that shot.
You look like a Ninj.
This Concert is hella Ninj.
by Trav is gay April 26, 2007

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To steal or take wrongly; to hijack; to snatch; most synonymous with "to jack"

One who ninjes is a ninjer, or in ghetto parlance a ninja.
that guy totally ninjed my pen
by usethisword September 15, 2007

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