Green’s Dictionary of Slang

fuckarse n.

also fuckass
[fuck v. (1) + arse n. (1)]

a general term of contempt.

[US]G. Cuomo Among Thieves 219: La Sala was really a slob, old fuck-ass everybody called him.
‘Rapture’ Diary 2 Jul. at Sweet-siren.com 🌐 ‘If you’re like that, you’ll never have a family.’ Why is he such a fuckarse?