I?ve googled the word pappenheimer too and the common definition describes what you mentioned above. So, pappenheimer seem to make red blood cells dirty, don?t they?
Looking for Pappenheimer into my encyclopaedia I found out that Pappenheim had been a General during the Middle-Ages commanding a regiment of soldiers called the “Pappenheimer” and had been very successful. Unfortunately, in the encyclopaedia there isn?t any advice whether the German term " [color=red]I certainly do know my Pappenheimer" has to do with them but in my imagination always when they?d done something unexpected the King recognized the way of their doing and created that sentence.
I?m not really sure whether my imagination fits to the actuality, but even nowadays when you see the result of any doing without watching the doing, but by the way it was done you can recognize who did, you might say : " I certainly do know my Pappenheimer! "
Now I only hope not to be a wisenheimer! :lol:
P.S.: Does buttinski stem from but?