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Fear Of Missing Out on Something Unknown. A specific type of FOMO. Unlike general FOMO, FOMOSU is when you feel FOMO but you don't know why.
Guy 1: hey man, how’s life?
Guy 2: idk, i just feel like something is missing...
Guy 1: bro, sounds like you have FOMOSU
by TheDawgPound94 August 30, 2019
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