Your mama is so fat that she doesn't get crushed by cars, she crushes cars and babies in strollers on the sidewalk when she falls and doesn't see any remains, so there is no evidence.
Yo Mama Crushes Cars and Strollers
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Explanation
Experiment
Explain Bear
Listen up, buttercup! This "your mama" joke is all about exaggeration, see? It's sayin' your mom is so dang big she ain't just avoiding cars, she's squishin' 'em! And not just cars, but babies too! She so fat, she defies physics and accidentally commits crimes, like a walking, talking natural disaster. Bet you're jealous you ain't thought of it first!