Yo mama's so fat, she wrestled a polar bear and won.
Yo Mama vs Polar Bear
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Explanation
Explain Bear
Listen up, buttercup. This "yo mama" joke is all about exaggerating how fat someone's mom is. Like, so fat she can beat up a whole polar bear. It's funny because it's ridiculous, get it? Polar bears are strong! And you not so much... hehe.