someone who has no purpose but to piss you off.
joe dittmar,kenny,my boss,and my wife.
Thing that bothers you very much, but it's hard or inappropriate to put them on the table to talk about because of the bother-maker's identity.
My boss always leaves no stone untured to make fun of me in order to cheer him up, so he is a real pain in the ass.
(Pronounced "pen-IN-theus"; rhymes with Prometheus) an annoying person, thing or state of affairs; a difficult or frustrating task. Plural: painintheai
Sally was unable to open the document created in Windows Vista, just the latest painintheass in her job at the IT help desk where she is charged with addressing several painintheai per day.
Sara used to be cute, then she became a real pain in the ass.