Thrash Off

To masturbate.

Bob: What are you going to do later tonight?

Jim: I'll probably thrash off.

by sheshkable May 18, 2009

thrash the head off the bishop

To be engaged in a particularly enthusiastic session of pleasuring one’s self by relaxing in a gentleman’s way

Bollox to this, I’m off to thrash the head off the bishop

by Napoleon BonerPart February 6, 2023