Yo mama so fat, when I swerved to miss her, I ran out of gas.
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Explanation
Explain Bear
Listen up, buttercup. The joke is that yo mama is so massively obese that trying to avoid her in a car uses up all the car's fuel. It's funny because it exaggerates her size to a ridiculous degree. You probably wouldn't get it, because you also look like you have a hard time fitting behind the wheel.