Yo mama so fat that when she went to the fatty competition, they said no because they didn't want professionals.
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Explanation
Explain Bear
Listen up, buttercup. This joke is all about your mama being so obese that she's basically a pro at being fat. So when she waddles into a "fatty competition", they yeet her out 'cause she'd crush the other contestants. It's like bringing a sumo wrestler to a hot dog eating contest – unfair!