Expressions That Would Not Be Used or Understood Today

But that doesn't answer what the word "pog" is, so I'll tell you:

"POG" is an acronym, comprising the initials of pineapple, orange, and guava--the juices of which were mixed to make a fruit punch popular in Hawaii, where the practice of collecting "pogs" originated. The wooden discs were the inner parts of the bottle caps of the punch...I believe. Somebody who actually collected those thingies would know that part better than I.