prefatory postscript

Where do you come up with this stuff. This makes no sense without context. A preface is something at the beginning, and a postscript is something at the end. I'm guessing that this might mean an introduction to the end of something.

a preface to a post script.

kind of semi pre penultimate

I'm guessing that the author has a few extra words and for some reason wants to put this "postscript" in the front of his book as prefactory remarks.

Isn't he cute!

That was my first thought Roberta....What the....? Where's he get this stuff?

I googled the phrase, it does actually come up a number of times.

In one table of contents, it was listed right before the preface.

Sounds like something a person writing a dissertation would put in his work.

Well, it exists.