Another term for a bagle, used mostly by people with a dislike towards them.
Why are you eating that bum muffin?
by eZsteve February 1, 2007
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1)term used to describe someone as their own muffin-like turd
2)another word for shit
"get lost bum muffin!"
by Simon November 11, 2004
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you know the fashion where the guys wear their jeans low? well, if a guy wears them mid-butt and theyre too tight he'll end up with a muffin bum (ie his upper bum overlaps the trousers). a real turn-off...

guys, before playing basketball, make sure you dont have a muffin bum!! its disgusting to watch!!
girl one: oh my god! look at that guy! he has a muffin bum!

girl two: euugh!! gross!! shield your innocent eyes!
by zebby.27 March 14, 2010
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Pertaining to an extraordinarily foul smelling bowel movement.
"Jesus, that cat just laid a funky bum muffin"
by Wyatt/Black December 1, 2008
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