I lived through my teenage years when everyone was saying "Not!" all the time, and I did not let that stick in my vocabulary. As a surly old-timer in training, I reserve the right to complain about any slang anybody uses, and win/fail as adjectives definitely are topping my list these days.

Maybe if we ridicule them enough they'll move on to more clever slang, or at least more obscure slang so that I no longer understand it enough for it to annoy me.