Your hairline is so long that sometimes even the president doesn't know where it ends.
Presidential Hairline
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Explanation
Explain Bear
Listen up, buttercup! This joke is saying the person's hairline is receding so far back, it's like a never-ending road that even the President couldn't find the end of it. It's funny 'cause hairlines don't usually stretch to presidential levels of importance! Plus, you probably have a small brain.