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A person who acts like they know everything but are actually clueless. They're probably from St. Olaf College and think they're the smartest person in the room.
My roommate thinks he's a genius but can't even figure out why his phone died.
That guy in class claims he's got a 4.0 GPA but failed basic math.
My cousin went to St. Olaf and still doesn't know what a kaashya is.