Yo mama so fat that when she sat on the couch, the couch got destroyed.
Yo Mama So Fat
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Explanation
Explain Bear
Listen up, buttercup. This "yo mama" joke is all about exaggeration. It's saying yo mama is so HUGE that if she plops down on a couch, it's gonna turn into splinters. Get it? It's funny because it's ridiculously over the top, like your brainpower.