royal pain in the ass
Also found in: Acronyms.
royal pain in the ass
rude slang Someone or something that causes a large or severe amount of frustration, annoyance, or aggravation. This new computer is proving to be a royal pain in the ass. It's been crashing at least once a day since I first started it up! These federal investigators have been royal pains in the ass. I know they have a job to do, but I wish they would just let us get on with our work.