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!"
adj. used to describe an action that is so amazing that it cannot be explained in any other way; typically used when an action in sports is unbelievable.
(playing pool) Bro number 1: "Hey bro, hit that 8 ball in that pocket off two walls." (shot goes in) Bro number 2: "That shot was so moneybutter."