Yo Mama and Saturn

Alright, listen up, you chucklehead! This joke is all about making fun of someone's mama being super fat. The punchline is, instead of thinking of Saturn with its rings, she's so large she mistakes it for "deez nuts." It's a dumb joke, but some folks think it's funny. And based on how long you took to understand that I'm guessing your brain is made out of mashed potatoes.