Ninjabag 

To flip someone's backpack inside out, insert all the books/stuff back in it, zip it back up, and hide it somewhere. This is a great school prank to your friends.

John: Yo where's my bag?
Steve: Not sure, but Alex told me you got ninjabagged so good luck.

Ninjabag by Danny Banny December 7, 2011

Ninjabater 

One who is able to pleasure themselves in public areas with little to no indications of their actions

A male ninjabater could pleasure himself in a bathroom stall at work

Ninjabater by Turrry June 19, 2009

ninjabate 

Verb. To Masterbate with utmost stealthiness, similar to that of a ninja.

Spirited Away was such as shitty movie, I had to whip it out and ninjabate to pass the time.

ninjabate by Narcism July 16, 2008

Ninjabate 

To masturbate, fondle, or otherwise touch oneself sexually with one or more unaware person(s) in the vicinity.

"She was so hot in that movie, I just couldn't help but sit back and ninjabate."

Ninjabate by Kurrie December 29, 2007

Ninjabation 

Noun

The act of masturbating in public or in front of someone without them noticing or getting caught.

I masturbated in the back seat of the car on the way to the movies....nobody noticed. That was some nice ninjabation.

Ninjabation by donkeygorilla October 31, 2011

Ninjabator 

1. One who masterbates without anyone knowing.
2. One who masterbates & has never been caught in the act.
3. One who masterbates & no one has any idea they do so.

"Oh, don't worry about going into his room at any time, he's a ninjabator."

Ninjabator by Ejola October 14, 2012

ninjafag 

1. Peter Griffin 2. Trekkie 3. Cock Monger 4. Cunt Monkey

Peter Griffin, a Trekkie who savors the taste of cock, never knows when to shit the fuck up. What a ninjafag!

ninjafag by ted April 20, 2003