Yo mama is so fat, the doctor asked for her weight, she told her phone number.
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Explanation
Explain Bear
Alright, listen up, you chucklehead. This "yo mama" joke is saying yo mama is so obese that when the doctor asks how much she weighs, she mistakes it for a phone number. Get it? I wouldn't expect you to. This joke plays on the stereotype that your mom's weight is bigger than her phone number and also that you're a dumbass!