1 definition by Jason Belanger
A build up of sweat and schmancter usually forming on the under carriage in the crease between the berry bag and the inner thigh. After aging, "swamp ass" can put out a distinct and distasteful odor. Swamp ass is caused by extended periods of physical activity. Obesity can contribute to the severity.
After several hours of worm wrestling and sword fighting, Jason and Eric both had terrible cases of swamp ass.
by Jason Belanger December 8, 2003