This is usually found in the crack of a fat man's ass. It's when the inner ass cheeks (the ass walls) rub together and cause irritation. The hair in and around this region causes friction and may lead to the man shaving his ass completely or/and stuffing wads of toilet paper in his ass as he leaves home each morning.
Jay developed wall blisters after walking around Six Flags all day.
by Hard Ass May 22, 2003