Your mama's so fat, when she asked for a water bed, they put a blanket over the Pacific Ocean.
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Explanation
Explain Bear
Alright, listen up, buttercup. This joke is all about exaggeration. It's saying your momma is so fat that when she asked for a waterbed, they didn't fill up a bed, they just covered the entire Pacific Ocean with a blanket! Pacific Ocean is really big like you!