The Story Behind Knee-Slapper and How It Became a Humor Classic
Knee-slapper did not begin as a catchphrase; it started as a physical reflex. A slap on the thigh was the body’s applause before the word “lol” existed. The gesture signaled that something was spontaneously funny, and over time the noun formed around the action. Today it labels jokes so funny they demand whole-body recognition. Etymology:…