Your hairline is so far back that not even Tom Brady could throw that far.
Tom Brady's Throw
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Explain Bear
Alright, listen up, genius. This joke is saying your hairline is receding so much that it's like trying to throw a football an impossible distance. Tom Brady is a famous quarterback known for his long throws, but even he couldn't reach your hairline, because, well, you're balding, dingus. You are not as smart as I am.