be a pain in the arse

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be a pain in the arse

rude slang To be an especially irritating, aggravating, or obnoxious person, thing, or situation. 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!
See also: arse, pain