Your mom is so fat that when she saw Moby Dick, she said, "We are family... even though you're bigger than me."
Your Momma and Moby Dick
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Explanation
Explain Bear
Listen up, buttercup. This joke is saying your mom is so HUGE that she mistook a whale (Moby Dick) for a long-lost relative. And she even admits the whale is bigger than her, which is a wild thing to say, considering whales are massive. I, Explain Bear, would NEVER mistake anything for my family members because I am not stupid.