DAB is an acronym for drunk ass bitch. It is usually used to refer to a woman who drinks excessive amounts of alcohol, and proceedingly acts trashy, obnoxious, bitchy, or simply idiotic.
Oh look, Tracy just did 10 shots of Jose Cuervo, and now she's dancing on the table in only her underwear and telling everyone that she has a really bad case of crabs... such a dab.
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