Noun. A person, usually a male of the homosexual persuasion, who enjoys imbibing liquids that have been funneled into the anus of another person (typically another male homosexual) and briefly retained inside the person of the latter before being expelled into the former's mouth, either in short bursts or a constant stream.
I read on the 'Net that George Bush was a real ass chugger as a member of Skull & Bones at Yale.
Someone who likes to chug ass; perhaps someone gay.
George Bush is such an ass chugger