Glad to bring it to light. I suppose I am understanding it better than I thought I did, but the term is new to me too.

Sort of tangential, but also worthy of discussion. I may start a springboard thread on the fact that it isn't just me. My mother has always tended to call everybody under 21 a "little boy/girl," and pretty much anybody under 40 is a "kid." She even refers to senior citizens using such terms as "boys" or "girls." I've rarely if ever heard her call anybody a "man" or a "woman." I suspect it's a subtle way of elevating herself above them, and/or deluding herself into thinking she's still young herself. (She's nearly 80.)

To me, a "little" boy or girl is prepubescent, and anybody of legal age can no longer be called a "kid."