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1.
Either when a single person holds in multiple farts and one time, and decides to release. Or when multiple people hold in a fart and release.
"Man, it smells like shit when you fart pool, go one at a time from now on."

"Okay, Seriously guys, who farted? If all of you guys are fart pooling, get the fuck out!"
by XoutcastX February 17, 2010