Somebody who thinks they know everything and know what they're talking about, when in all actuality, they know absolutely nothing. They tell everyone
useless facts that they pulled out of their ass to try and
sound smart. There is no convincing them that they are wrong.
Person 1: Did you know that if you eat
poison oak leaves, you'll
never get
poison oak?
Person 2: Um... where the fuck did you hear that..
Person 1: uh... i read it.. in a book.
Person 2: Wow.. you're a fucking moolack.