Does anyone use the word "barf" anymore? I don't think I've uttered the word in anything other than a parody manner in a good fifteen years. I mean, "puke" is so much better (and "yak" does well in a pinch).

Is its usage limited to youth? Do kids still say it? No, probably not, they certainly have cooler, hipper ways to convey upchuck. "Plube" they'd say, as in "Aww, man, that lunchroom meat smells so foul, it makes me want to plube!" Or, "Make out with Kevin Federline? Like, plube in my mom's shoes!"