1. A buildup of sweat between one’s butt cheeks, either caused by overheating or the extreme need to defecate.
2. The uncomfortable feeling of ass hairs sticking together with sweat and poop particles, causing the area commonly referred to as the ‘taint’ or ‘grundel’ to take on a swamp-like texture.
1. Dude, I wouldn’t wish my worst enemy to run his tongue through my swamp butt right now.
2. Every time I have Mexican food and go running, my butt starts sweating uncontrollably and I get swamp butt.