Yo mama so fat, she broke Usain Bolt's 100 meter speed record by taking ONE STEP!
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Explanation
Explain Bear
Listen up, buttercup. This joke is about your mom being so obese that just one step of her can beat Usain Bolt in a 100-meter dash. Usain Bolt is like, a super fast runner. You probably don't know him because you're too busy eating crayons.