A sunburnt arse is a person whose face has become so swollen with sunburn that it looks like an arse (of generic appearance). Typically of English origin. There are no know cures.
babe: 'hey whats that baboon on heat doing staring at my tits ?'
dude: 'thats just a sunburnt arse!'
dude: 'thats just a sunburnt arse!'
by wise_spatula January 23, 2012