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1.
An awkward or shy attempt at smiling that results in the lips being stretched in a thin line, like a muppet.
I'm not very good at taking compliments. Usually I end up blushing and making a savage muppetface.
by racharound September 12, 2012
 
2.
A condition that occurs to a middle-aged woman’s face where features become more Muppet-like. Characterized by fat over the eyelids, and a very straight thin lipped unhappy appearance. Usually accompanied by duller hair and skin color.
Clariise used to really a hottie. Now she has turned into just another muppet face bitch.
by jumpin george September 13, 2013