Your mum is so fat, when she slept on the bed, the bed cracked and they had to replace it by a dinosaur.
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Explanation
Explain Bear
Listen here, you chucklehead. This joke is all about your mama being so obese that when she plops down on a bed, it breaks and gets swapped out for a whole dinosaur! The joke plays on the ridiculous idea of someone being so fat that they can break furniture and need a prehistoric creature as a replacement. Honestly, you probably believe dinosaurs still roam the earth.