V8 Slap
Slapping another person's forehead with the backside of your palm, as popularized in the commercials for a certain tomato juice.
Dude 1: Man, you ordered a whole meal with no vegetables?
Dude 2: Yeah. What's wrong with that?
*Dude 1 V8 slaps Dude 2*
Dude 2: Alright, I'll go to the salad bar.
Dude 2: Yeah. What's wrong with that?
*Dude 1 V8 slaps Dude 2*
Dude 2: Alright, I'll go to the salad bar.