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A galaxy chin is a chin that doesn't have a crack in the middle or any crack at all just a tiny hole. It's so rare it's like finding a clean sock in a laundry pile. The hole is about the size of a pen tip. That tiny hole makes it look like a galaxy. So it's a galaxy chin.
My cousin’s chin is a galaxy chin. I’ve never seen anything so perfect in my life.
She took a selfie and said, 'This is the first time my chin looked like the universe.'
He tried to split his chin and failed. Now it's a galaxy chin.