knee-slapper

A funny story or event. Generally used facetiously. If not used facetiously, the user is a dork.

AHAHAHAHA, that's a KNEE-SLAPPER!

by emelizabeth October 31, 2004

knee slapper

something that is stupid and funny at the same time

Guy 1: So a guy walks into a bar...OUCH!
Guy 2: ROFL THAT'S A KNEE SLAPPER! *slaps knee*
Random Guy: Oh yeah? How bout a face slapper! *slaps Guy 1 and 2's face*

by Skullex May 18, 2008

the knee slappers

A group of nine friends who make weird jokes and react to them by saying "that's a knee slapper, har de har har" and slapping their knees.

Knee slapper #1"And then the whale said, wait whales can't talk!" the Knee slappers "That's a knee slapper, har de har har!"

by A knee slapper April 07, 2013

Knee slapper

adverb. A term used to describe a dumb-ass joke. Its inception was the result of someone noticing their friend slapping their thigh/knee when a joke was told. It's an official "knee slapper" when the person laughing sqints their eyes, slaps their knee, and can barely speak due the amount of laughimg taking place. This definition is considered a "knee slapper".

What do you call someone who doesn't fart in public?

A private tutor!!

-knee slapper

by MegDar September 21, 2009

knee slapper

A blunt that is so large, or otherwise so potent, a hit causes you to slap your knee and say "GAH'DAM."

We's burnin knee slappers in this bitch.

by The Pizza Man March 30, 2006

Knee slappers

When a woman has saggy old lady boobs that hang so low they slap her knees when she walks

I'd totally do your mom bruh, knee slappers turn me on

by JarMa13 December 04, 2018

knee-slapper

antonym for a bad and cheesy joke

Guy 1: what do you call cheese that isn't yours?

Guy 2: Idk what?

Guy 1: nacho cheese

Guy 2: now that's a knee-slapper!!!

by billystiggle December 10, 2011