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A person so dumb they could make a rock feel embarrassed. Everyone in the galaxy knows their face and their stupidity.
My cousin is a galactic idiot. He tried to build a spaceship out of Legos and failed.
The teacher called him a galactic idiot because he answered '12' when the question was 'What is 2 + 2?'.
He's a galactic idiot. He eats pizza for breakfast, lunch, and dinner.