1. 'MM', me, a plain crazy mofo.
2. Ridiculous attempt on a porn site admin.
3. A very open-minded person. Likes to talk about everything. Especially about sexual orientation.
4. Uses to randomly hump clueless lamers. Term used to indicate humping nearly everything.
5. Ugly as hell.
abbreviated = 'MM' (see 'mm')
"Stop mefisto-monstering me, you stupid dog!"
A: *humps B*
B: "I'm no Mefisto Monster! Get off of me!"
A: "But you're so ugly, you have to be!"