What is Gmac?
1.
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.
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a guy with a cock that is similar in size to a roll of dimes
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when a girl performs oral sex on a man while giving him a hand job. All at the same time!! :)
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