arse (arses plural )
1 n-count Your arse is your bottom.
(BRIT)
INFORMAL, RUDE
in AM, use ass
2 →
a pain in the arse →
pain
smart arse (smart arses plural )
The spellings smartarse in British English and smartass or smart-ass in American English are also used. If you describe someone as a smart arse, you dislike the fact that they think they are very clever and like to show everyone this.
INFORMAL, RUDE n-count oft N n (disapproval)
...smartass comments.