Stealthurbate 

Masturbate in public stealthily so no one knows you're doing it.

When she was little, Kennedy would stealthurbate under the beach towel and no one around even guessed.

Stealthurbate by ApricotFields August 2, 2019

stealtherbate 

To masturbate and hope your roomate(s) don't know you are mastrbating. This is usually done after lights out or in the bathroom.

Garrett: I have a boner but there are three other guys in the room.

Bram: Why don't you just stealtherbate?

stealtherbate by Matthew and Bram May 18, 2008

stealthsturbate 

verb- 1. The act of discreetly masturbating, due to heightened risk of being found out. The usual context is in where one can no longer contain their sexual urges, and feel they must relieve said urges in a less than ideal place.

Last night, I stayed at a friends house, and had to stealthsturbate under a blanket to keep from going crazy.

stealthsturbate by flar-dar-lartz February 9, 2014

stealthturbate 

The act of fapping as quickly and silently as possible to avoid detection.

He had to go and his family was moving about the house so he had no choice but to stealthturbate.

stealthturbate by Bananajameson September 4, 2015