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A mix of dumb and clueless. Someone who believes in something so stupid even a brain-dead donkey would laugh at them.
My cousin thinks the moon is made of cheese. I told him it's a lie. He said, 'No, it's true. I saw it on YouTube.'
My friend's dog thinks he's a wizard. He's a naitard.
My teacher said the Earth is flat. I said, 'Are you high?' She said, 'No, I'm a naitard.'