An acronym for the phrase 'Punk Ass Bitch'. Used to describe someone who is acting like a bitch, only worse.
Dylan: "JC's been pissing me off lately, he's such a buzzkill."
Pat: "I know, he's a PAB."
Passenger in car: "Dude, that dickhead just cut you off and crossed into the other lane!"
Driver: "FUCKING PAB!"
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