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A fancy way of saying someone has a head so big it looks like it was stolen from a giant. Might also make them a little slow, or super strong if they're dumb enough to use it.
My cousin has a head like a beach ball. He also thinks he's the smartest man alive. He's not. He's just loud.
She walks into class like she owns it. Her head is so big, it blocks the sun. And she still failed math.
His head is so big, it’s like he’s wearing a helmet. And he’s still confused about fractions.