Swamp Anus Share definition Flag When your butt crack gets very sweaty and swampy. Usually on humid summer days. Sometime has some poo mixed in. Running really gave me a bad case of swamp anus. And i sharted. Swamp Anus by H.R. September 10, 2006 0 0 Get merch Get the Swamp Anus mug. Buy Now — $32.95 See more merch