A small creature that crawls into your anal cavity and proceeds to create muffins at his leisure. Mind you, these are no ordinary muffins. Once created, there is only one way for the muffins to exit your rear.
Damn that assmuffin made muffins in my ass.
by Jon November 28, 2003
Get the assmuffin mug.
someone who has no boobs but a huge ass
guy 1: do you think shes hot?
guy 2: uhh, she gotta donk i guess.
guy 3: yeah she's a total assmuffin.
by smellymellyhasabelly December 16, 2010
Get the assmuffin mug.
dry pieces of shit that accumulate on or around your sheets, comforter, or even boxer briefs
damn, I need to start wiping better, I had ass muffins all over the place!
by Jon Himself March 26, 2003
Get the assmuffin mug.