Top definition
A fog-like stench created when one farts in the closed area of a steamy shower room or sauna. The stink bonds to the steam and mist of the enclosed area and alters into “Bum-Fog.”
No way would I sit in the Bum-Fog of a YMCA sauna.
by treasury of the clubhouse August 08, 2010
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Donkey Punch Plush

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