A Wass is a nasty fucking wart. It is isn't just any nasty wart it is a fucking nasty wart on someones ass.
Guy 1: this fucking chick called Nina sent me an ass pic and guess fucking what cunt
Guy 2: what you had a good wank over it
Guy 1: Yeah Nah cunt she had a fucking ass wart
Guy 2: so Nina has a Wass aye. thats fucking nasty