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Once somebody farts and it the initial smell has disappeared, but then the smell returns, this is referred to as a stray fart.

Can also be used to indicate that someone is hanging around like a bad smell and should leave.
I wandered into a stray fart over there, man was it smelly!

Haitham is being such a stray fart.
by Baron Boffin August 31, 2009
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