knee slapper

Sarcastically used to point out an unfunny joke. It originates from the act of slapping one's knee during vigorous laughter. Later took on a sarcastic meaning.

Comedian: I just flew in from Los Angeles, and boy are my arms tired!

Audience member in sarcastic tone: wow that's a real knee-slapper

by Joe February 11, 2003

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

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

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.

by Springloaded June 6, 2004

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*

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.

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!

by emelizabeth October 30, 2004