ninja sturb 

Combining the skills of a Ninja and the pleasure of sturbing, a ninja sturb is a stealth sturb. Often used when your roommates are in the room or just for the challenge.

My roommate came home early so I had to ninja sturb while he wasn't looking.

I ninja sturbed while watching a movie with my girlfriend, that way I could call her ugly her when she couldn't get me up later.

ninja sturb by braunbj October 26, 2004

ninjasturbate 

The act of masturbating silently. (orgasms or bodily fluid noise)

Jacks landlord was on his ass for making noise. So he had ninjasturbate

ninjasturbate by Chinchillagod1000100100010110 January 24, 2012