When you hold in a poop in a car with the seat heater on and your poop starts to water down and it runs down your butt.
by shit mc D May 13, 2015
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When it’s hot and you’ve been sat down for ages causing your bum to sweat lots
person 1: “Hey I’ve been gaming for hours and my bum is wet”

Person 2: “You my friend have got something called swamp ass
by MBARR October 09, 2021
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The term used for when your ass starts to sweat intensely. Swamp ass is a living nightmare. It makes your ass smell like you just sharted. It's gross, and is a reason to wipe your ass like you wipe your floors.
"Sat down with swamp ass for the entire day. Now every seat I sat on smells horrible."
"I feel you, man. I had a hot girl next to me once. Needless to say, swamp ass ruined everything."
by Pango456 April 29, 2019
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When you go swimming and you can't change out of your swimwear right away.
Aw man, I've got swamp ass.
by shanehole April 02, 2016
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