Yo mama is so fat, they had to flood the Super Bowl to give her a bath.
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Explanation
Explain Bear
Alright, genius, let me break it down. You see, the joke is about how incredibly obese 'yo mama' is. She's so enormous that a massive event like the Super Bowl needs to be flooded just so she can take a bath. It's an exaggeration, get it? It's funny because it's ridiculous, and you're not.