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

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 20, 2009

Knee Slapper

Sumthing very funny and ridiculous

Thats humungous.....
Thats Wat She SAid

ROFL THATS A KNEE SLAPPER!!!

by SALKFJsalfk February 17, 2008

Knee Slapper

When someones penis is so big that it slaps the inside of their knees when they walk.

What size condom would you like?

Let's just say it's a knee slapper.

by Erak22 September 27, 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 April 20, 2006

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 February 3, 2012

knee-slapper

something really funny (from the slapping of the knees and hitting the floor associated with laughter.

That was one heck of a knee-slapper.

by The Return of Light Joker September 27, 2008