Top Definition
The place inside the anus where your excess farts are stored for later in use during the day.
Kyle was storing his farts in his fart sac, then Marc punched him in the stomach and Kyle proceeded to fart, releasing all the farts from his fart sac that he stored.
#fart #fartsac #smelly #anus #the butt
by FART MAN October 07, 2013
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