I've never heard that term before. Gawd you people are old;) This is also the only place I've ever seen or heard people use the word "folks". The "folks" has nothing to do with this question, but I just wanted to say that. :)
Lol! Believe it or not, as a youngster, I abhorred the word "folks", and I never used it. I only use it on AnswerMug in whimsy, sort of a throwback to the Warner Brothers cartoons and their closing credits.
Lol :) I don't consider myself a "youngster" but this is the only place I ever see that word used :) You aren't the only one here I see use it... I thought it was one of your weird "Amug cult" words. ;)
Lol, it was in back in the 1970s, I didn't make it up. Its meaning refers to the old vinyl music records of that time period, which had an A side and a B side. The singers' or groups' best songs were on the A side, the less-popular ones were on the B side. The smaller records were known as 33 1/3s, because they played at 33 2/3 revolutions per minute. The medium sized ones were called 45s, because they played at 45 revolutions per minute, and they and the 33s had one song on each side. The larger records were known as 78s, for 78 revolutions per minute, and they had an entire album's worth of songs between their two sides.
The expression "catch you on the flip side" referred to the way a record had to be flipped over in order to hear more music. There would be a few seconds between listening to the end of side A while waiting for side B to be flipped over, so it became a way of saying "see you later".