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A person who thinks they're a genius because they know random facts and will argue about them like they're life-or-death. They don't care if they're wrong as long as they sound smart.
'Did you know penguins can't walk backwards?' 'No, but I just did.'
They spent 20 minutes explaining why the sky is blue in a DM.
At the dinner table, they interrupted the whole family to talk about the number of sides on a stop sign.