a comical expression of surprise used in the popular2006movie, Borat, and copied in various parodies including Yu Gi Oh, the Abridged series.
Doctor: you have cancer
Guy who's just watched Borat: wawawewa!
Doctor: I'm serious.
Guy who's just watched Borat: so what, I have Ipod, you have ipod mini, everyone know ipod mini is for girls!!!
Doctor: you know what else?
Guy who's just watched Borat: what?
Doctor:your an idiot
Short-hand for the word floccinaucinihilipilification, meaning the estimation of something as valueless (encountered mainly as an example of one of the longest words in the English language).