jetturbate
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 spa yesterday - i think he was trying to jetturbate."
Jetturbating
Using the jets of a pool, hot tub, or any similar structure to derive pleasure; effectively masturbating but removing the necessity of touching the genital region.
Kim: I walked in on Chad in the hot tub! He said he was just trying to clean his junk, but I could tell he was jetturbating.