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The abbreviation meaning, (Gay Ass Porn Magazine), often used in random conversation for laughs. The phrase is used in the ICP song Slim Anus. GAPM is a future magazine yet to be invented by the gays for the gays.
Guy 1: Dude did you check out the edition of Gapm today ?

Guy 2: No you faget , get away!
by antinc511 June 14, 2011
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