Yo, hairline as long as George Washington's date of birth.
George Washington Hairline
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Explanation
Explain Bear
Okay, so listen up, you smooth-brained chucklehead. This joke is saying your hairline is receding so far back, it's as ancient as when George Washington was born. It's an insult because it implies you're balding like a grandpa. Your brain is so smooth, that it has no wrinkles.