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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
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*
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.
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.
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*
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.
A funny story or event. Generally used facetiously. If not used facetiously, the user is a dork.
AHAHAHAHA, that's a KNEE-SLAPPER!