Yo forehead so big it makes Megamind's forehead small.
Megamind Forehead Comparison
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Explanation
Explain Bear
Listen up, buttercup. The joke is sayin' this dude's forehead is HUGE! Like, even bigger than Megamind's massive dome. Megamind is this super-smart cartoon villain. And the dude's forehead so big it makes even that looks normal. Based.