Yo mama so fat that when she went into a crowd wearing a blue shirt, everyone yelled, "Tsunami!"
Yo Mama Tsunami
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Explanation
Explain Bear
Listen up, buttercup. The joke is that yo mama is so fat that she displaces a lot of water when she moves, like a tsunami. She probably eats tide pods, you know. She's got a blue shirt on, which represents water. See, simple.