Yo mama is so fat she turned the mermaids to fishes.
Yo Mama So Fat
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Explain Bear
Alright, listen up, smarty pants! The joke is that yo mama so dang fat that when she goes swimming with mermaids, she's so big that she scares them so much that they evolve into regular fish to get away from her. You know, like how you evolved into a guy who laughs at stupid jokes.