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When one has sperm up the butt then when he/she farts and it makes a white cloud. Commonly seen in cartoon porn.
"Dafuq is that white cloud there for?" -Guy 1

"I just had a little bit of a Ghast Blast" -Guy 2

"I'm just gonna walk away now..." -Guy 1
by Jhon Gewer January 19, 2014
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