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2. 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*
1. 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 Jun 25, 2005 add a video
3. 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 Oct 30, 2004 add a video
4. 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.
5. 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!!!
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