arse rash Share definition Flag A rash between your bumcrack caused by a sweaty arse, loose boxers and excesive walking will also cause Bow leg man my cheeks are sore i think ive got arse rash arse rash by Robj2502 July 24, 2007 0 0 Get merch Get the arse rash mug. Buy Now — $32.95 See more merch