To masturbate using a jet from a spa or hot tub instead of one's hands. Usually done by the extremely lazy, those trying to be discreet, or those trying to claim they do not masturbate.
"Steve looked like he was having too good a time in the spayesterday - i think he was trying to jetturbate."
Ruler of Lake Titicaca. Rumored to have a bunghole that gets very angry if it does not receive toilet paper. Cornholio the Great is often seen walking around with his shirt over his head and his hands in the air, chanting songs about his power, and his bunghole.
"I am Cornholio! You do not want to face the wrath of my bunghole, for I need TP!"
Butthead: Shut up, Beavis! (uh huh huh huh)
Beavis: Um, okay. (heh heh heh heh).