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

Ninjamation

The guestamation of a fuckin' Ninja.

"That ninja has some badass ninjamation skills, he ninjamated the exact time that dude was gonna get punched in the face!"

Ninjamation by ThatNinja January 2, 2011

NinjaMaster29 

"What's a joe shoe?"

A NinjaMaster29 is someone who slightly knows the anime JoJo's Bizarre Adventure,

and they know JoJo through memes.

It is someone who only knows part 3 and the latest animated part of JoJo,
and their favorite fight is probably Jotaro vs Dio from Stardust Crusaders.

Guys, we found a NinjaMaster29 in this discord server.

NinjaMaster29 by iAmTheBigGamer March 17, 2020

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

Ninjamaica 

1. The title and character of a show pilot for the Canadian television network Teletoon Detour; "Ninjamaica"

"yo mon, did you catch dat episode of ninjamaica last night?"

"haha yeah, that show just makes me think 'what de bom bom?' "

Ninjamaica by Theabes January 8, 2010

Ninjasation 

To interrupt and join a conversation with the participants unaware you have joined.

Conversation between more than 2 people and the person having the "ninjasation"

Ninjasation by Almighty Adam and Awesome Ryan February 25, 2011