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.
by Ill mon May 06, 2007

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
Person 2: Dude that's a mouth boner
by sweaty-weeb February 09, 2015

"I'm dying for a good Philly cheese steak. One if those is giving me a total mouth boner"
"Yo somebody's getting some liquid diarrhea tonight."
"Yo somebody's getting some liquid diarrhea tonight."
by Deathcloud420 September 14, 2019

by smoo616 December 29, 2007

by 5444tvfshm8 November 26, 2018
