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When too much gum shows on the top row of teeth when smiling
NEIGH. that girl has major horse mouth
by skyezzz September 13, 2016
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Someone who has a mouth similar to a horse, also, generic term for someone. Used much in the same sense as "asshole".
That girl would be hot if she didn't have such a horsemouth." or "Stop eating all the french fries horsemouth!
by bigvindogg August 10, 2010
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An girl suffering from the affliction of coming from the English middle or upper classes. Typical characteristics include a reduced lower jaw and enough teeth to fill two normal mouths. Sufferers may also show signs of such diseases as "Being a Sociology Student".
Christ, someone get the sugar cubes, the horse mouth's braying again.

She was no bad till she smiled and her bottom jaw fucked off.. shame. Horse moothed tae fuck.
by I_have_a_chin January 28, 2009
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A person, normally a girl, who is so boot ugly that she carries what looks to be a horses mouth on her face.
Damn she gots a horse mouth
She's a real horse mouth
The village bicycle has a real horsey mouth
by Joshua Bradford- Michigan December 10, 2007
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