Another variation of
Smash.
Like the word "
smash", hash means to have sexual relations except with one's hands.
It can also be defined as another word for a hand job or fingering.
Kell: Yo
Doug, how was your weekend?
Doug: Eh, it was alright I mean she was super hot
chick but she only let me hash.
Kell: Damn that sucks hand jobs get old real quick.