Yo mama so fat, when they buried her, they named her Everest. Mount Everest.
Yo Mama Everest
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Explanation
Explain Bear
Okay, listen up, buttercup. This joke is saying yo mama is so fat that when she got buried, her grave was so huge they called it Mount Everest! Mount Everest is a big mountain; get it? It's funny because it exaggerates her weight to a ridiculous degree! You are probably also fat!