knee slapper 

From (Or inspired from) The Tom Green song "Pet names for Genitalia"

A penis.
Because it slaps your knees, if you're horribly unproportioned.

Peggy Sue called me a Knee Slapper instead of a dick today.

knee slapper by Springloaded June 6, 2004

Knee Slapper 

1) An otherwise unfunny, awkward, or just stupid joke. Usually a dad pun or something of the sort. Said after this to show that it should have never been said in the first place. Invented by hillbillies and rednecks when sitting on their porches, slapping their knees when somthing funny happens.


2)said after something funny and stupid happens.

1)
dumb guy:"Two peanuts are walking down the street, and one of them was assaulted!"

normal guy (slaps knee and fake-laughs):"Wow! That sure was a knee slapper!"



2)
guy skates and falls off rail, hurting his knee and friend laughs.
Later they are talking and laughing about a dumb joke.

friend:"wow that sure was a knee slapper!" (slaps knee)

skating
guy:"yea!"(slaps knee very hard, and dislocates it from the earlier accident)

friend:"no that's a knee slapper!"

Knee Slapper by dhawk123 March 8, 2009

Knee Slapper 

A saying a person does when another person says an unfunny joke but you're being sarcastic about it, indicating it was the funniest joke you have ever heard in your life. (being sarcastic if you didn't get that)

"Hey Billy, why did the chicken cross the road?... TO GET TO THE OTHER SIDE!" *laughs hysterically*

"What a knee slapper, Timmy!" *slaps knee*

Knee Slapper by lovelyleftorgan777 May 4, 2022

knee-slapper

when someone slapps their knees because somethings really funny.

eg. danas brother sings and dances to 'its raining men' KNEE-SLAPPER

eg. claudias hair is ranga *slaps knee*

knee-slapper by dont you just wish you knew July 13, 2009

knee-slapper

a joke that is so silly that in order to handle it you must slap your knee

Rick told me the best knee-slapper yesterday.

knee-slapper by KROGO July 6, 2005

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!

knee-slapper by emelizabeth October 30, 2004

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!!!

knee-slapper by billystiggle February 3, 2012