ninja beat 

The act of silently masturbating while in the same bed as your significant other, likely while they are asleep.

My girl didn't want to give me head during her period week, so I had to pull off the ninja beat several times.

ninja beat by Arjiff January 8, 2014

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

ninjabeast 

A ninja beast is someone who is fast like a ninja and awesome like a beast. Or Someone who is just amazing

That guy is such a ninjabeast.

ninjabeast by NInjabeast January 12, 2009

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

NinjaBeans 

When a situation is ridiculously awkward, ninjabeans is the safe word.

Some bitch - "So ya i like to shave my back hairs like this.. wanna help?"
Friend 1 - "NinjaBeans!"
Friend 2 - "Well we'd love to help but i gotta go cut my dick off..."

NinjaBeans by KrizlySon January 8, 2011