What is Knee-slapper?
1.
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.
2.
A funny story or event. Generally used facetiously. If not used facetiously, the user is a dork.
AHAHAHAHA, that's a KNEE-SLAPPER!
3.
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*
See
4.
something really funny (from the slapping of the knees and hitting the floor associated with laughter.
That was one heck of a knee-slapper.
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