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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.
assmuffin by Jon November 28, 2003
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.
assmuffin by smellymellyhasabelly December 18, 2010
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!
assmuffin by Jon Himself March 26, 2003

Sassmuffin 

A woman who, despite being small and cute, packs a whole lot of sass.
She seemed so cute and harmless, but once she opened her mouth I could see she was a regular Mongolian sassmuffin!
Sassmuffin by G.FRESH. October 28, 2010

Ass Muffin 

The smell that exists when a bunch of teenage boys sleep and eat in the same room for over 24 hours without showering. If you experience the ass muffin smell you are advised to internally combust, because your life is over.
zomg that hax! He UnleasHED a nasty ass muffin smell!
Ass Muffin by Greg J.B March 27, 2007

ass muffin 

a term of endearment. A term an ass master may call someone they consider a friend.
My little ass muffin is home.
ass muffin by Megdolly December 10, 2008