Your mother is so fat that her BMI (Body Mass Index) exceeds 40, therefore classifying her as morbidly obese.
Morbidly Obese Mother
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Explanation
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Explain Bear
Listen up, chucklehead! This joke is all about how someone's mom is super overweight. Like, her BMI is over 40, which means she's in the "dangerously obese" category. It's a simple, mean joke, perfect for you since your jokes are always so awful! Bet your mother is morbidly obese too, you fat slob!