beserwiser

besserwisser/człowiek, który sądzi, że wie wszystko najlepiej, zarozumiały znawca, samozwańczy koneser, niepowołany mentor.
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Meaning "knowing better". And that's exactly what it refers to, like the more common "smart ass" or "wise ass", or even "smart elick" (smart aleck). A besserwisser - or wise ass - is a person, often intellectual, or at least pseudo-intellectual, who thinks he or she has more general knowledge about things than most others. It can be correcting language mistakes in grammar and spelling, or it can be within a specific topic like everything from politics, geography and baseball to history and science - anything you can imagine!