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A vertical smile is another word for vagina. If a closed smile is turned 90 degrees it resembles a vagina, giving you the term vertical smile.
I saw her vertical smile open up and next thing i knew she was pregnant.

Dude i banged that chick so hard last night, her vertical smile was 10 times bigger when i left.
by Anna C August 11, 2006
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1. an ass crack
2. too moon someone
While Rich was driving I gave her a look from my vertical smile.
by Bud E Love May 07, 2003
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Illinois vulgar slang for twat
I remember when I heard a kid in the neighbor call the local perv a vertical smile, years later the bastard was filming shit-stabber porn.
by illinoishorrorman January 18, 2018
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