attic fart 

An unusually odorous and stale fart that seems to be pushed out from very high up in ones bowels. First used by Mike Clark of the Drew and Mike radio show on WRIF in Detroit, MI.

Was that your attic fart, or do you have a squirrel that died two weeks ago in your pocket?

attic fart by Shift_Master December 17, 2010

Attic Fart 

A fart so stinky, it smells like it’s been living in your grandmothers attic.

Dude, that ass air smells like a straight attic fart .

Attic Fart by nicajima November 19, 2017