Thrash Off 

To masturbate.

Bob: What are you going to do later tonight?

Jim: I'll probably thrash off.

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

thrash the head off the bishop by Napoleon BonerPart February 6, 2023

trash off 

A word used to tell an annoying individual to back off and hit the trash can

wow bro just TRASH OFF

trash off by larryman948 December 12, 2016

trash offset 

Similar to carbon offset, trash offsetting is the act of voluntarily picking up and disposing of trash/litter from the street, in order that at some later stage one can drop one's own with a clear conscience.
If done responsibly the concept often eliminates the inconvenience of having to find an appropriate receptacle for items of waste, while also having a net gain for the environment.

"Hey man, you can't just leave that burger wrapper in the street!"
"Hell yeah I can, I picked up three cans today."
"Trash offsetting huh?"

trash offset by NickJGrey February 18, 2009