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A small room, commonly a closet, that has been dubiously filled with the ranky dank aromas of multiple individuals’ nasty diarrhea farts.
Mike: Dude, did you catch a whiff of that fart den at Michael’s?

James: Hell no, fart dens are gay as fuck.

Mike: Your loss, bro.
by A Smelly Black Anus January 03, 2018
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