knee-slapper

knee-slapper

[nee-slap-er]
noun Informal.
a joke evoking boisterous hilarity.

Origin:
1965–70, Americanism

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Dictionary.com's 21st Century Lexicon
Main Entry:  knee-slapper
Part of Speech:  n
Definition:  an extremely funny joke
Dictionary.com's 21st Century Lexicon
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