In reply to:

when I was 13 or so, boys the same age would tease about "an over the shoulder boulder holder". Is that a local mocking term– or did young boys everywhere tease young girls with the same term?

I happened to be living in New Zealand between the ages of 11 and 13, and the boys who plagued my existence way down there used exactly the same phrase, even though "boulder" was rather hyperbolic at the time (and, sadly, still is)