It is a reference to a female who is somewhat ditzy yet cute at the same with with round cheeks.
"Aw look at that little girl, she's such a muffin face!"
by Muffinsss January 16, 2012
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A face of which the teeth are clenched, and the mouth is formed to a tight, creepy circle. Is used as a universal symbol of random/weirdness. The ideal face used to bite into a muffin.
Courtney: Wow, these muffins are delicious! *makes The Muffin Face* *Bites into muffin*

Maddy: Yeah, I want another! *makes Muffin Face* Anyone want to split a muffin?
by crazyboutfood September 28, 2009
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