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thigh-slapper

American  
[thahy-slap-er] / ˈθaɪˌslæp ər /

noun

Informal.

  1. a very funny joke, remark, story, or incident.

Etymology

Origin of thigh-slapper

First recorded in 1960–65

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.