I say this as a connoisseur: this is literally the most phoned-in OP in the history of Unfogged.
It's a tweet, brah. I'm just fighting the fragmentation of our online lives. Learn to see the subtext.
Yesterday I asked my four-year-old to do something and he said "Hang on, brah."
Another friend said her kids in that age range picked up "brah" in the last week or so. I'd be shocked if mine ran across it, though two-year-old Selah learned "deuces!" from her (white) daycare teacher and uses it often and adorably. Where is this coming from?
I remember the first time I heard someone say "clueless". I remember having to think for a moment to figure out what it meant.
It's odd how I can on the one hand wonder who is thinking up all these new words and phrases, and on the other hand, wonder how we managed to live so long without them.
(I'm referring to you as the royal "they".)