a pain in the arse
pain in the arse
An especially irritating, aggravating, or obnoxious person, thing, or situation. Primarily heard in UK. You know, Jack, you may be my friend, but you can be a real pain in the arse sometimes! This calculus homework is a real pain in the arse. It's not that I don't understand it, it's just so tedious!
a pain in the arseBRITISH, INFORMAL, VERY RUDE or
a pain in the assAMERICAN, INFORMAL, VERY RUDE
COMMON If someone or something is a pain in the arse, they are very annoying. These people were an almighty pain in the arse to deal with. Note: The words bum and backside can be used instead of arse and the word butt can be used instead of ass. When I was bored, I was a pain in the bum. All this airport security's a pain in the butt. Note: `Arse', `ass', `backside', `bum' and `butt' are all informal words for `bottom'.