Bro, your head is so big that it shines so bright, it turns into a lightbulb.
Lightbulb Head
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Explanation
Explain Bear
Listen up, buttercup. This joke is saying your head is so massive and shiny that it's basically a lightbulb. They're saying you got a big noggin, and it's so reflective it could light up a room. Think of it like having a chrome dome that's also a portable sun. Also you are so dumb.
Anonymous
Ur so dumb that you can't even spell 😵