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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

monochode 

A monochode is a penis that is wider than it is long, otherwise known as a chodewith the addition of having only one large testicle. This birth defect is also known as being monotescular.
Leo: Did you hear the rumor about Jimmy? Well people are saying he has a monochode. Andrew: I believe it.

Monkfish 

An insult used to insult people when you are short of insults.
Seen as a plan B option to insult people which will always get you respect an admiration.
Also a fish that tastes nice
Joe: Your mum is fat
Bob: er *blank* your such a monkfish
Joe: ...
Crowd: *cheers*
Monkfish by maniacishere October 21, 2009
A popular photographic concept on Instagram, involving all shots and images in a purely monochromatic theme, using a black-and-white tone (hence the "mono", from "monochrome") to add contrast, perspective, and/r create an entirely new abstract concept to the capture. However, it isn't simply a "black-and-white" shot. It is intended to be used for greater artistic effect. Invented by a guy named Josh, from Singapore.
#monoart is taking over Instagram by storm. You can put "monoart" on anything to make any ordinary object seem more ideational.
monoart by sonicflood February 19, 2013

mono wave 

After anal sex the reciving participants ass hole leaks cum
She had a huge mono wave after last night
mono wave by Crustinisation December 8, 2016

swine mono 

The mono you get from pigs.
Dude, Madelyn got swine mono from Chris.
swine mono by mallllllllarondo April 28, 2009