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1.
A term of endearment romantic or not, similar to muffin.
Awww, muffinpants, it'll be alright. *hugs*
av pennylane 2 april 2005
 
2.
This is when you wear your pants around your waist to tight and a roll of fat hangs over the egde, just like a muffin!
OMG look at the fat hanging off around the pants.

Yeah thats a muffin pants
av Sam 26 juni 2004
 
3.
A term used to describe someone who is acting silly or generally being stupid.
He is being such a muffin pants!
av DrBobSmith 3 mars 2012