Didn't you read the article? No cap is out. Even I, a middle aged ex-hipster knew that. ;) (I know, emojis are so over)

I was in Paris and somebody was complaining that that the kids were saying "en vrai" all the time. I explained to her that it's "for real" which is one of my favorite 200x era hip hop phrases.

Most slang goes way back. "Cool" is 1930s black jazz culture, and now every white grandma say it without it even sounding odd.