Douben

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

doubenize

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.