Yo mama so fat, when she put on a yellow raincoat people see her and yell "Hey yo, taxi!"
Yellow Raincoat
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This joke is all about your momma being super huge. So huge that when she throws on a yellow raincoat, folks mistake her for a taxi. Get it? Taxis are yellow and big-ish, like your brain. It's funny because... well, it's not that funny, but it's about size!