(1)An insult thrown at one younger than you, one of less status, or someone you plan on beating close to death. It implies that they are indeed a sock puppet made specifically for use with ones ass.
(1) "I'll wipe my ass with your face, you fucking ass-muppet."
by ProjectSOBER April 05, 2003
A complete and total loser who spends his or her days jerking off to anime porn whilst eating potato chips and smearing the grease all over themselves. It is also a fat, lazy fuck with gravy stains all over his or her shirt who watches TV all day.
Clem wouldn't come out his room all day because he was whackin it to DBZ reruns; he is thus an ass-muppet
by DJClue77 April 20, 2006