Top Definition
An upholstered couch, settee, or other form of seating, which has been saturated with flatulence to the point that its foam interior permanently reeks and may well have acquired a brownish tint.
I don't mind watching the football game at Joe's house, but there's no way I'm crashing on that fart sofa after everyone's had chili dogs.

On "My Strange Addiction", I saw a woman who eats bits of foam cushion from used couches — can you believe she actually snacks on fart sofa?
by FlatusMeister August 20, 2011

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