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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.
by dantephreak July 10, 2008
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A slap upside the head to give someone a wake up as in:
"Wow! I could have had a V 8!
If he doesn't stop running around with those gang bangers, somebody needs to give him a V 8 Slap before he ends up in jail.
by NY_Grandma October 31, 2007
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