Yo mama so fat, her belly button got 15 minutes before her.
Yo Mama's Belly Button
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about your mom being so obese that even her belly button has to show up way ahead of her. Like, it's so far away that it needs a freakin' time zone. Get it? No? Well, you're probably as dense as a black hole.