Yo mama's so fat that Jane Goodall couldn't tell if she was a chimpanzee or a human being.
Yo Mama So Fat
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Explanation
Explain Bear
Hey, listen up, dummy! This "yo mama" joke is all about making fun of how fat someone's mom is. Like, she's so huge that even Jane Goodall, who knows a ton about chimps, couldn't tell if she's a chimp or a human. You know you could use a bit of Goodall's brains too.