Wet arse 

A wimp, a weak and weedy , needy person.

You're gutless , such a wet arse.

Wet arse by Mamasa September 30, 2021

wet-arsed 

An insulting term a mature man might use to humiliate a teenager. It implies he is prematurely out of nappies and hence has a wet arse.

Don't annoy me, you wet-arsed little prick!

wet-arsed by F. J. December 12, 2008

wetarse 

Something you say to take the piss out of someone or something

Jeff: "Quit giving it revs, Alan"
Alan: "Piss off wetarse!"

James:"Your jacket is bare wet"

wetarse by ArableLand May 17, 2018