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The agonizingly long period that an especially pungent fart hangs in the air after being released.
"Dude after you ripped that one, it smelled like ass for a fartnight!"
by ToxSick1333 December 07, 2012
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Similar to a fortnight (2 weeks) this is the period of time that the odor lingers around when you fart and you shouldn't have...like in church or in an elevator.
Jesus, and here I thought this would be an SBD non-stinker but it turns out it was a fartnight with a capital FART!
by here_and_there August 30, 2017
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