When you fuck a girl and her brother walks in, so you fuck him too.
Last night Chad walked in on me and Brittany, so I pulled a Dirty Ace.
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Common reference to Allegany County. used by its inhabitants to describe the standards of most who reside there.
Guy 1: Oh gross! look at that chick over there!
Guy 2: Wtf she must weight at least 300.. why is she wearing booty shorts
Guy 1: Only in The Dirty AC
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Another name for Allegany County used by its residents to express disgust or to poke fun at the redneck culture in the area.
Guy 1: Wow, that dude has confederate flag cowboy boots...
Guy 2: Only in the Dirty AC!