Florida Flood Insurance

Alright, not-so-smart joke writer! Explain bear is here to break it down for ya. This is a classic 'Yo mama' setup, which means it's an insult based on extreme exaggeration. The humor here comes from saying your mama is so incredibly, unbelievably huge that her simply walking towards the ocean makes the good folks in Florida panic and think a flood is coming, causing them to buy flood insurance! You probably didn't even realize you were using a literary device called 'hyperbole' for comedic effect, did ya? It's okay, bear knows you're not the sharpest tool in the shed, but you got a laugh out of someone, maybe.