Top Definition
a wet fart, or a drippy fart, or a nasty squirting fart,any fart that leaks more than air...
someone farts and it leaves a litlle residue BUT MUSTARD when you fart and have to wipe yourself or think you have to check your underwear you spit but mustard
by hassan.j March 04, 2008
5 Words related to but mustard

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