Scary mofo, don't mess with him. He will **** you up.
Don't mess with SlappyMuttMutt!
by Allen Woods September 18, 2003
1 more definition
A very 1337 chater/hacker. Most of the time undercover not being noticed doing important work.
Dude, shut up, SlappyMuttMutt might be listening...
by Elliot Shend September 14, 2003