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.
by HayBritnayHay November 15, 2010
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 "
by CYPF. March 26, 2017