"Yep. Nope. Very definitely."
Kathryn Schulz, a writer for The New Yorker, heard that seemingly-contradictory response to a question recently. And once she started listening for it, she heard it everywhere: people agreeing by saying "No, totally," or "No, definitely," or "No, for sure."
In a recent article, Schulz digs into what's behind this linguistic quirk.