Found it ! Ich habe den Piedel gefunden !!!

It is a slang word in the area around the city of Bremen (North Germany - near Hamburg):

"denn auf gut bremeisch ist ein kleiner Penis ein Piedel,und eine richtig schoene Beleidigung ist: 'du kleiner Piedel'.

So, if you want to insult someone in Bremen, call him a "kleiner Piedel" !

(This information comes from German Google - searching under the word "Piedel" and on a decidedly weird and dodgy website under the Google heading "headquarters".)

Unfortunately, it seems from the German Google search that a lot of people have the surname Piedel. Hopefully, they don't live in Bremen.

- jeanie