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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
17 5

Words related to mouth boner

boner mouthboner shit eating grin smile stiffylip