making something serious beyond all other seriousness. it is never to be abused, used to trick someone, or used in conjunction with a lie. It can be used as a question asking the truthfulness or seriousness of a previous statement, or used in ones own sentence either before or after the sentence to describe its truthfulness or seriousness.
Guy 1: hey wake up the building is on fire!
Guy 2: Dude for real?
Guy 1: YEAH, dude for real.
Matt: hey, dude for real, there is a giant bee stinging people to death outside.
VInce: oh, well thanks for the heads up. i will stay inside.
Matt: good idea.