knee-slapper

[ nee-slap-er ]
/ ˈniˌslæp ər /

noun Informal.

a joke evoking boisterous hilarity.

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seclusion

Origin of knee-slapper

An Americanism dating back to 1965–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021