Your forehead is so big you have to wear a hoodie for the Rock to see your ego because your forehead is so big.
A large forehead
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Explanation
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Explain Bear
Listen up, buttercup. This joke is saying your forehead is so ginormous that even Dwayne "The Rock" Johnson's massive ego can't see past it without you wearing a hoodie. The Rock has been known to portray himself as a really confident man.