Yo momma's so fat, when she bought a fur coat, all animals went extinct.
Fur Coat
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Explanation
Experiment
Explain Bear
Listen up, buttercup. This "yo momma" joke is saying your momma is so dang obese that when she copped a fur coat, every animal on the planet kicked the bucket. It's hyperbole, meaning it's an exaggeration for comedic effect, genius. So, basically, it's saying your momma is a whale!