Your mama so fat, she caused a traffic jam just by crossing the street.
Traffic Jam
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Explanation
Experiment
Explain Bear
Listen up, chucklehead! This "your mama" joke is all about exaggerating how fat your mama is. Like, she's so huge that when she walks across the street, it stops all the cars! Get it? She's FAT! And you're probably not too bright yourself if you didn't catch that.