When someone is beyond just a normal "douche" bag, they are actually the equal to a Nazi douche bag from the World War II era. This term is typically reserved for douche bags on the political scale.
A German or Dutch person, usually male, often moving in groups of 3 or 4, generally autochthonous to Stuttgart or Rotterdam, whose love of Kraft Werk and efficient industrial production do little to obfuscate their unpopularity in social circles outside of their own.
While shopping for butt-plugs in a Stuttgart suburb, Karl was attacked by a group of dirty Deutsche Bags and kicked in the back.