Colloquial term for vagina, cunt or pelvic gash. Used in place of the term "vertical smile" that suggests a horizontal arching of the vagina, which is just awful.
Tyler: I bet Sarah Palin's vertical mouth is au naturale.
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The view of a vagial area that at a specific angle resembles the mouth of an animal of the arangatan family .
" Hey Frank did you see the VERTICAL MONKEY MOUTH on that sleezy stripper ,she should work at Arby's with them sleeves "
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