Yo forehead so big that when I asked Vegeta how big it is, he said “IT’S OVER 9000!”
It's Over 9000 Forehead
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Explanation
Explain Bear
Listen here, smartie. The joke is that the person's forehead is so big it's being compared to the "Dragon Ball Z" character Vegeta's famous line, "It's over 9000!" You probably can't even name 3 different Dragon Ball Z characters. Get some knowledge, kid.