The condition resulting from inadequate wiping of the anus following defecation, which can cause the afflicted to appear monkey-like as they dig in their butt, trying to appease the itching.
"Man I have a severe case of monkeybutt. I need to use your bathroom for a few minutes."
by JeremiahN June 26, 2007
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.
"Man, I got a serious case of monkeybutt bartending tonight!" or "Landscaping gave the rudest monkeybutt yesterday!"
by Mick September 21, 2003