A condition of severely sweaty butt cheeks or crotch, where the sweat and any un-wiped or leaked fluids or poo from bad hygiene combines to make a disgusting stain that not only stinks up a 10 Ft radius in a crowd but attracts a horde of flies, hundreds of which collect on the stain and feed from it. overly tight nylon pants on a big female booty exacerbate the problem by intruding into the butt crack and wicking the fetid smear to the surface. The sufferer is sometimes unaware of this and does not correct it, leading to randomly taken pictures of their fly-infested ass appearing on the internet at their expense.
Nigel: Oh man- look at that nasty whore with the big booty and red pants! Is that a brown stain in the crack of her ass or a horde of flies on a brown stain?
William: Shit man, she's got the Swamp Ass!
by abjectus May 07, 2012

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A common description of the weather in Southern Georgia, particularly Valdosta, in the American South, in the southeastern United States
My brother was explaining the humidity in Valdosta, Georgia and said "'Have you ever heard of 'swamp ass'?
by 88mphsss July 28, 2011

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When the crack off someones butt becomes so sweaty do to strenuous physical activity. Usually takes place in humid areas.
man i hate doing yard work. ya i know what you mean, i still have swamp ass from that shit.
by kronickilla October 05, 2010

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"Donkey" from Shrek.
"Donkey" was a swamp ass in the first Shrek movie
by hallnut1 September 02, 2010

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When the area bettween your buttcheecks, commonly reffered to as the butt crack, becomes sweaty and stinky.
After the soccer game friday, Ryan had a bad case of swamp ass.
by brit_legit February 04, 2010

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excessive buildup of moisture around your "junk"
I was sitting in the library when I got the worst case of swamp ass.
by Pitt Rules Bitch February 09, 2003

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A condition in which anogenital sweat intermingles with remnant fecal matter, overgrowing anal flora, and sloughed skin cells, producing intense bioactive fumes that may offend anyone.
"The bus rider wore unclean sweat pants and stank of swamp ass."
by TurkeyOnRye June 13, 2016

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