Wiktionary
interj. (context slang British English) Indicates incredulous disapproval, contradiction or disbelief.
Usage examples of "my arse".
Because when we had dysentery and I was shitting myself, the Bible was something that I could clean my arse with.
Before I can open my mouth he has wrapped his hairy fingers around my windpipe and swung me into the street, pushing me backwards into a little row of dustbins where I fall flat on my arse, getting stuck in this ridiculous sitting position as Jamie proceeds to whack me around the head with a dustbin lid.
Find out what my chances are if I work my arse off to go to the Olympics in four years.
I feel 'is prick 'ard against my arse sawing away between my buns while 'e twiddles my tits and I start to cry.
I don't want to be sitting here in a dusty hall, in front of a crowd of half-wit politicians and social climbers, stuck on a wooden Throne while my arse goes numb, but I'm here.