California smile 

Forcing someone on to the ground, commanding them to open their mouth and place their teeth on the side of a curb or slab of concrete, and then stomping on the back of their head/neck, effectively smashing all of their teeth, breaking their jaw, and possibly killing them.

What happens to the black fellow in American History X. See Bite the Curb

California smile by Brandon August 8, 2004

California Smile 

A useful technique to use against newbies and annoying people in which the offender's top jaw is placed on a sidewalk and crushed.

Carrot Top appeared in one too many AT&T ads, he needs a California Smile.

California Smile by Carve October 8, 2003

California Smiley 

Also known as a cement smiley, Joey gives Tommy a California smiley by stomping on Tommy's head when Tommy is biting the curb. Tommy will then have a California smiley and probably be dead. The film American History X popularized this fight move.

Big Bad Dan threatened to give James a California smiley if he didn't watch himself.

California Smiley by Zeeeeeeebopadoobopa June 29, 2005