Born Guesser Share definition Flag A student that doesn't do their homework but argues about his score; often by citing random anecdotes. That guys a Born Guesser. He found some random website to argue he knows more than the teacher. Born Guesser by EconFreak May 5, 2016 0 0 Get merch Get the Born Guesser mug. Buy Now — $32.95 See more merch