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A bet where no money or property is involved, and the prize for losing is getting to slap the loser across the face. Excellent for bets of extreme importance.
A slap bet is often monitored by a slap bet commissioner, that regulates the rules of said bet.
"Joe cried after he lost his slap bet"
"In a matter of this importance, only a slap bet will do"
slap bet by mrcool November 23, 2006
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Bet made on an item of trivia in which the losing party gets the shit smacked out of their face.
A: I think it's clavicle.
B: It's definitely tibia.
A: Slap bet?
B: Sure. (They shake.)

Later:

C: A bone named after the Italian word for flute is tibia.

(B smacks the shit out of A)
slap bet by heisenbergian August 29, 2009

fish slap bet 

A variation of a slap bet wherein the loser has to buy a fish for the winner so the winner can slap the loser with it.
Peter: I fish slap bet you thriller will play on halloween night.
-------------------------------
(day after)

Adrian: buy me a wish!
Peter: OH.....crap!
fish slap bet by andrepa November 12, 2009

The Slap Bet

From the iconic show How I Met Your Mother: If one loses a bet they can choose 10 slaps at the moment or 5 slaps that can be used at any time.
If you lose you have to choose one of the options from the Slap Bet.

poop slap bet

A pact that is made by firmly grasping the hand of another with a solid dollop of feces between the palms. After the handshake, whomever loses the bet gets slapped with a similarly smeared shitty hand.
"Bro, I bet you can't stick this pencil all the way into your dick hole."
"....Wanna make it a poop slap bet?"
"You bet your shitty hands I do"
poop slap bet by matfremay2015 December 8, 2018
Beth- another name for dick
Slap that Beth- Slap dick
You think you hot because you hit my ex? Slap Beth pussy
Slap Beth by King Bay-Al January 11, 2018

better than a slap in the belly with a wet fish

better than it could be
Complainer: This movie/pizza/vacation sucks!

Responder: It's better than a slap in the belly with a wet fish!