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When someone has exactly the same facial expression in every selfie.
"Oh God, I was looking on Facebook earlier, and Sheena is pulling that monoface of hers in like six consecutive selfies."
Monoface by Cartoon Hero May 19, 2014
Related Words

mong face puffer fish

An ungly, stupid person that resembles a fish

Mong Face 

When someone is being morose because they haven't got their own way they often pull a face and lip like a sulky Downs Syndrome
"Why can't I have it"?

"because you can't, and you can take that Mong Face off as well"!
Mong Face by APPLEBY-QUOTES January 16, 2009
It's like monotone, except with the face. Just one face; it doesn't change.
Berkli: I put smiley faces on all my texts.

Ashlyn: I don't, because I don't want to be monofaced.
monoface by uujenna May 6, 2010

mingface 

1. a word for use when you frget someones name.
2. a really nasty looking person.
you are such a mingface
mingface by malice November 20, 2003