To sit in a hot office and sweat around the buttocks.
It's so hot I have swamp thong!
by radar864 April 1, 2008
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A swamp thong is when your ass sweat creates a dark place on your pants shaped like a thong!
It can lead to swamp ass and if untreated it lead to a more serious condition called duck butter. This can lead to fungi in the ass crack and genital area requiring medical attention!
Look, that guy in playing volleyball in the cutoff jeans has a swamp thong

Damn, its so hot today; if i'm not careful i might end up with swamp thong.
by Jimi7849 July 17, 2021
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