I'm a 40 y/o proud GenX'er (best generation ever!) who has a 21 y/o daughter AND just went back to university to finish my degree–so I'm knee-deep in Millennials.
In my experience, Millennials don't talk like this in-person. I do see a little bit of it in SnapChat, YikYak and Instagram. In fact, my wife says "totes" more than any 20-something I've witnessed. Other "words" I've seen used a lot during app communication are "bruh", "fam", and "af".
But when I observe 2 Millennials talking in person, the only way they butcher the English language is by using the word "LIKE" 4 times per sentence. Makes me cringe every time!