1. Describes a hellishly hideous person.
2. The final stage of ugly.
3. Short for "Motherfucking ugly."
4. The state of which one becomes when one gets too hype in any situation, caused by crumpling of the face.
1. That bitch is muthafugly!
2. Yo, that baby isn't ugly
! It's muthafugly!
3. Joe: You're motherfucking ugly.
Jim: Dude, just say muthafugly.
Joe: Oh, ok!
4. Hey, look at Dave getting muthafugly on the dance floor!