Originates from the End of the World flash movie, and was said by the Kangaroo before the world ended. Means literally "what the fuck, mate?" and is said in moments of confusion, surprise, or disgust. Is especially popular amoung slightly nerdy high school intellectuals who like flash movies like "Weebl and Bob" and "Homestar Runner."
Julie: Dude, we have a test in AP Chem today.
Bob: WTF, mate?
a loser...someone who tries to be like like other people to much...someone whos a cornball etc...
none needed -everyone knows someone like that
knasboll is a swedish word
du är en knasboll=your a goof ball (it always depends on who you call it or when you call someone that it can be a nice insult as well as a relly bad one)