Yo mama's so fat, her pad is a king-size mattress.
King-Size Mama
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Explanation
Explain Bear
Listen up, buttercup! This joke is all about how super-duper fat yo mama is. Like, so big, she needs a king-size mattress just for her 'pad,' which is slang for her butt. It's funny because it's exaggerating how large she is. You probably don't know what a mattress is because you sleep on hay.