Definitions by west coasts most wanted

Boston Smile 

When you make someone open there mouth and put there teeth on a hard gritty surface (preferably a curb) and then stomp on the back of there head with your foot. Like on the movie American History X.

Billy was being a dick and decided to steal my girlfriend so I gave him a good ol' boston smile!

Boston Smile by west coasts most wanted March 13, 2010