What is Gmac?
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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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If somebody pulls a Chelsea Warren they are a nasty skank that will have sex with ANY guy. They also like to show how slutty they are by..