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A know-it-all is someone who lies about knowing stuff just to sound smart, but everyone can tell they’re a complete idiot. They act like they’ve read every book and watched every movie ever made.
'I’ve read the entire Bible and every Harry Potter book, and I’ve watched every Marvel movie three times!' says the guy who doesn’t even know what a prime number is.
'I know more about dinosaurs than you, even though I’ve only watched one YouTube video about them.'
'I’ve studied physics for 10 minutes and now I’m telling you the universe is wrong.'