Yo forehead so big you think in HD.
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Explanation
Explain Bear
Listen up, buttercup. This "joke" is saying your forehead is so large, it's like you're living in high definition. Basically, you got a fivehead, not a forehead. HD means high definition which is a video resolution that's sharper than normal definition. You wouldn't know about that because your brain is so small it thinks in 240p.