(Have you deliberately chosen a name with the n~ character to make it difficult to type??? :) This key doesn't appear on an American keyboard, nor is it available among the single-character shortcuts LEO provides. Maybe it's easier on a European keyboard.)
I literally have been looking for this for several years. Not intensively, not full time nor for hours at a time, but I've been looking, repeatedly, posting queries on message boards, etc.. With Google I tried "Saturday Evening Post" along with all the appropriate word combinations I could think of - "fake German" "ersatz German", "fractured German". (Ersatz is a normal English word, meaning artificial or fake http://www.m-w.com/dictionary/ersatz
. English meaning I think is slightly different than the German meaning, right?) No luck. Interestingly the closest I got was a recent search with "fractured German", for which I found - guess what? - a link to my own posting right here in Google!
The phrase "mock German" never occurred to me, though when I now see it, it's obvious.
It makes me think... It's normal and familiar to us that Google searches for words and phrases, not ideas. But when you think about it, wouldn't it be nice to have a way to search for a concept or a topic itself, rather than to have to guess at the words that someone might have used to express it?? In many cases we do want the words, but there are plenty of cases where we're looking for an idea, irrespective of the words used to express it. I can imagine all sorts of technical and conceptual and practical complications of an ide search... but I have little doubt that Google has a team of people working hard right now on exactly that goal.
Thanks again for your help.
(I see you're from Munich. I enjoyed a nice visit to your fair city less than a year ago. My partner was delivering a professional lecture at a conference, and we combined it with a vacation trip.)