In the two years since I first wrote about seeing “AF” — the abbreviation for the intensifier “as fuck” — in various interesting places, I’ve kept track of its spread from the fringes to the mainstream, or at least a major tributary of the mainstream, of popular culture. In April of this year, when I noted its use in New York subway advertisements by the food-delivery service FoodKick, I speculated that this was the first time AF had appeared in a commercial context. Well, I was wrong. It wasn’t the first. And it certainly hasn’t been the last.