Yo momma is so fat, her bellybutton gets home 15 minutes before she does.
Yo Momma's Bellybutton
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Explanation
Explain Bear
Listen up, numbskull. This joke implies that "yo momma" is so overweight that her bellybutton, which is located at the front of her body, arrives at a destination a full 15 minutes before the rest of her does. It's funny because it exaggerates how fat someone is and makes a ridiculous comparison. You probably look like a potato.