The word for a persons rear end spoken by people who use correct english. It makes no sense in American English. To take the trouble to do something, as in " I can't be arsed to do that". Like the red squirrel by its grey cousin, this particular word is danger of being subsumed by the increasingly popular 'ass'. They say 'ass' for 'arse' Ass is a synonym for Donkey. The original spelling of the word that has now been high jacked by the dumb-arse yanks - still means a rear end or stupid.
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Because a wild donkey is stupid and stubborn, ass is used in British English speaking countries as a term of abuse too, but the meaning is subtly different to arse.
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Poor Donkey! Yes, it is just another word for a butt. Arse unknown. The Eagle Has Landed