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This occurs when you actually try to hold in a fart. The sound of the gas rushing back into your system creates a sound just like an actual fart. Caused by guacamole and bean burritos and store brand raisin bran.
(Fart sound)
Dude 1: What the fuck dude!!!
Dude 2: It was a reverse fart, I swear.
by 2014_chiguy January 26, 2010
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