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1) an amalgamation of the terms preposterous and postulate used to describe an absurd claim or assumption.

2) an adjective describing a predated postulate or principle
person A: "That girl's so innocent, she must be a virgin."
person B: "That's prepostulatious!"

person A: "I firmly believe the Republicans will win the next election."
person B: "Man, that's totally prepostulatious!"

person A: "Did you know the Earth is flat?"
person B: "What the hell are you smoking man? That's totally prepostulatious."
by balbir January 22, 2008
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