Interjection: An expression used to ridicule an idiot who says something stupid; usually done by the ridicular directly into the idiot's face; must be done in context, with tightly pressed lips, a shit-eating grin, wide open eyes, and a parkinson type head shake.
Yarv: Dude, you shouldn't have done that.
Shooty: (Directly in Yarv'sface) HMMMM...Kyum on Yarvie!
Yarv: Whatever.