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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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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The reports read were from the horse's mouth
by Jaymore November 27, 2017
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The act of two girls scissoring on a man's cock until he fills each womens muff full of semen and then he watches them eat it out of eachother like an anorexic model eating saltine crackers and watches them spit on eachother till one gives up
" went to the club two hookers gave me a horse mouth handshake for quite the deal
by cfrankyo June 26, 2015
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Getting information from the highest authority.

Origin:
When you get a tip for a horse race, the tip is better as nearer it is to the horse e.g. the jockey or the trainer. When you got it straight from the horse's mouth, you have it directly from the source.
This tip is foolproof, I got it (straight) from the horse's mouth!
by TheSunToucher August 12, 2009
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interrupting someone by finishing their sentences/words for them
boy, in an argument with his father:

boy: dad, sorry, I'll skip dinner tonight and (...)

father: (...) finish your chemistry and physics projects you are working on? That would be nice.

kodem koll, dad, stop putting words in the horse's mouth, and FYI it's actually Italian and Latin homework I was going to work on, later on the chemistry and physics.
by Sexydimma April 29, 2014
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