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When one finds something extremely amusing, while seated the person slaps their own knee in jubilation.
That joke was a hellava kneeslapper, I laughed my ass off.

by Count Funkula June 13, 2003
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Aug 3 Word of the Day
A way of expressing that someone is sexually attractive. It is often used with irony or playfulness.

Comes from the verb “breed” which is to copulate with intent of bearing children.

For someone to be truly “breedable” they need to be fertile.
Anon: You are looking mighty breedable this fine evening, m’lady.
Stacy: Please don’t say that to me.
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Brad: Woh, you look submissive and breedable, Becky.
Becky: Wow, thanks. *sex*
by 100PercentEthylAlcohol July 14, 2021
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2
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*
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3
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 June 25, 2005
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4
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
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5
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
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6
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 17, 2008
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