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1. Mack is a short from of MacIntosh, a waterproof overcoat, named after its inventor. To “get your mac on” means to stay dry. 2. Mack is a euphemism for a condom, another form of waterproof overcoat. To “get your mac on” at the severe end of petting is an invitation by a woman to the guy to have sex with a condom on.
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