A verb meaning "to be bothered", and invariably used in the past tense and in conjunction with the words "couldn't be". It originated in the North of England.
Against the odds, he threw the basket ball from the other end of the court and arsed it in.
He wins a lot of the time, its all arse.
I scored a 1/6 on Worde, obviously it wasn't skill, but all arse.