Named after the short but tenacious Syracuse point guard Gerry McNamara, a GMac is any inprobable clutch or momentous action a person pulls off, usually at the last second.
I can't believe Tom pulled that test grade out of his ass -- that was a total GMac.
by tmck1352 December 12, 2006
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a gaysha person who wishes he was chris brown. has a chode, has small arms, and has no game at all. only gets guys, not girls. gives blumpkins, and loves to give an alabama hot pocket.
yo look, its gmac
by gaysha123456789 March 31, 2010
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Acronym for “Give me a call
Ok, gmac when you’re done.
by Pem Mcflum October 27, 2017
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