Your mum's so fat, she's the iceberg that sunk the Titanic!
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Explanation
Explain Bear
Listen up, buttercup. This "yo mama" joke is saying the person's mom is so obese she's like a giant iceberg. And you know what happened to the Titanic when it hit an iceberg, right? It sunk! Get it? You're about as sharp as a marble, I swear.
Satanas
Oooo good roast uwu