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What some people say GPC stands for when they're too wasted to care what it really means.
My buddy said GPC means 'gag puke choke' because he tried to smoke three at once and threw up in the trash can.
At the party, someone yelled 'GPC!' and then fell over laughing because he had a mouthful of soda.
My sister said GPC was her favorite acronym because it meant she could blame her cough on the cigarettes.