One's anus or butt hole. Also known as stink valve.
My grandpa always said, "if your fart ring itches, that means it's dirty."
by BD Mcgee December 29, 2014
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When your fart smells just like Burger King onion rings. Typically happens 6-8 hours after consuming Burger King Onion Rings.
Phew!! BK onion ring fart!! I know that smell ANYWHERE!!
by luknoi October 3, 2013
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