Top definition
A shit eating uncontrollable grin. It is best explained by the guy in the Disarono commercial after seeing the chick deep throat the ice cube.
Did you see the mouth boner on Brent's face when he was watching the Jude Law movie?
by Ill mon April 26, 2007
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2
That tingly feeling you get in your mouth when you think of a certain food or start eating something you've been thinking about eating.
Person 1: Why did my mouth feel weird when I took a bite of that Thin Mint?
Person 2: Dude that's a mouth boner
by sweaty-weeb February 09, 2015
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