Someone who has extreme experience at mutilating a man or woman's anus. They ravage and make the rim incredibley sore/red. Has been known to render butthole useless for extended periods of time, and, in extreme cases, induced comas. However, many flock towards these people as when a buttholedestroyer enters your anus the ripping and tearing of the skin around your anus brings forth extreme pleasure - instant climax.
When someone fucks so much sheep butthole that they start to resemble a Sheep-man. People who have sheep butthole-titis typically have the curse of being named Peter.
Doctor: So if you were a male sheep and you came across a female sheep would you fuck it?
Peter: Foo! I don't have to be a sheep to fuck a sheep I fuck dem already!
Doctor: Well it looks like you have sheep-buttholetitis...
Peter: So...Can I keep fucking sheep?