guy 1: what do you call cheese that isn't yours?  guy 2: idk what?  guy 1: nacho cheese  guy 2: now that's a knee-slapper
antonym for a bad and cheesy joke
"guy 1: what do you call cheese that isn't yours?  guy 2: idk what?  guy 1: nacho cheese  guy 2: now that's a knee-slapper" What is the definition of "knee-slapper"?