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When ones cock is so big, that once inserted into a vagine, it leaves no room for anything else, not even air! The insertion causes mass and rapid evacuation of all the air, resulting in a somewhat awkward sound (a pussy evacuation)
"I swear, I didn't fart.. "
"Yeah I know... Puss-E-vac (pussyvac) :)"
by MessyEssie February 05, 2010