Why is yo mama so fat? She follows rap boat's diet.
Rap Boat Diet
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Explanation
Explain Bear
Listen up, smoothbrain! This joke is all about your mom being overweight. The joke says she's on a "rap boat diet," which sounds like she eats a lot. But it's really a play on words of "wraps boat", implying she eats so much that she could eat the raps of a boat or ship. Yo mama so fat!