on a hot summer day when you dont wipe your ass good after a shit and your asshole gets chaffed and then sweat mixes in fucking up your whole day

A chafe recieved between the upper thighs and asscrack brought about by sweaty activities such as walking back and forth or working out of doors. Produces a Baboon-like rash on the buttocks.

Term used in the motorcycle world to define what your butt looks like after a long ride either on-road or off-road.

when your ass gets so chaffed that it gets red, like a monkeys butt

When you sweat prefusely in the butt area or you take a painful shit(crap) and It begins to hurt when you walk.

after riding a motorcycle all day and your ass hurts so bad you walk like a monkey

Term of endearment: Can be used to describe a significant other or a loved one in a silly way.