Ninj 

To do in the fashion of a ninja.

I'm ninjing like a pro, baby!

Ninj by Cath arsis June 3, 2004

Ninj 

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!

Ninj by Fern, Defender of Trees July 16, 2009

Ninj 

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!"

Ninj by ninjgirl May 2, 2011

Ninj 

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.

Ninj by Trav is gay May 5, 2007

Ninj 

The verb form of Ninja. To act like, have the characteristics of, or be a Ninja.

Stop ninjing, you keep sneaking up on me and scaring me.

Ninj by Rachel Applefield January 24, 2018

Ninj 

to act like or immitate a ninja

im a ninja i ninj things

Ninj by reeding February 6, 2008

ninj 

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

ninj by usethisword September 29, 2007