Your mum is so fat, when I was driving I had to swerve to avoid [her]. By the time I had finished, I had ran out of gas.
So Fat
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Explain Bear
Listen up, buttercup. This "yo mama" joke is all about exaggerating how fat yo mama is. I mean, so fat that someone driving a car had to swerve for so long that they ran out of gas. Like you ran out of brain cells already.