Are you up-to-date and in-the-know? John Brandon for INC.com advises that the words you’re using may reveal more about your generational age than you thought. 8 Words That Totally Reveal You Are Not a Millennial For those working in offices full of millennials, you may want to watch your language, JK. Guess it’s time to learn the new slang, 15 Words and Phrases Millennials Use but No One Else Understands and be right on, no wait, on fleek.