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1.
The area in between your ass cheeks will become damp and sweaty and partially lube your ass cheeks against eachother. A very dank, ass-smell will arise from your ass cheeks. The equivalent to MTV's Big Black's "Mud Butt", but with sweat instead of shit.
When a hot day when you exercise a lot, the area in between your ass cheeks will become damp and sweaty and partially lube your ass cheeks against eachother. This is called SWAMP BUTT
by Jesse Higgins January 20, 2007
 
2.
1. pertaining to the condition of over-active sweat glands of the grendle, and gluteus maximus; 2. way to much moisture "down there". NOTE: often cured by GoldBond Medicated Powder
Playin basketball sure caused the onset of a serious case of "swamp butt".
by THE TILLMAN February 09, 2004
 
3.
Extreme moisture build up inbetween a persons butt cheaks during the summer months.
Damn this swamp butt is getting old down here in Florida!
by FloridaSwamp August 23, 2011