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what you call someone who thinks they know something but they don't. they even sound like they know what they are talking about.
The student was a total doubenize in class say stuff that sounded smart but wasn't.
A douban is a slang term that is called someone that is acting like douchebag/dick /bastard pronounced (DO-Ben)
Man - who is that guy?
woman - don't know but I heard he's a douben