Your momma's so dumb, she took her driving lesson on a dinosaur.
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Explanation
Explain Bear
Listen up, chucklehead! This joke is saying your momma ain't the sharpest tool in the shed. Taking driving lessons on a dinosaur? Dinosaurs went extinct like 66 million years ago! It's a goofy way of saying she's dumber than a rock. And you, my friend, probably think rocks are smart.