but something tells me that conversation is not over…
Such memories are, of course, suspect, but I recall it from junior high school in southern California in the mid-late 1970s.
I left SoCal at the very end of ‘73 and I don’t remember it, but San Diego was significantly behind LA in trends. I was about to say it was maybe a shortening of “whatever you say” and popularized by Zappa’s “Valley Girl” song, but there it is on wikipedia’s Valley girl article.
FWIW, I find it annoying and a little precious to have the title of an article use a cap on only the first letter of the first word, that is, unless otherwise called for. But I’ve been wrong before. It must be a trend the curve of which I am behind.