It's possible:
* You heard it incorrectly: It's easy to mishear words, especially when dealing with unfamiliar languages.
* It's a misnomer: Perhaps you're recalling a phrase that was misattributed to Germans.
* It's a niche slang term: While unlikely, it's possible this term exists within a specific group or region during the war and hasn't been documented.
To get a more accurate answer, it would be helpful to know:
* The context: Where did you hear this phrase? Who was using it?
* The intended meaning: What did you think it meant?
With more information, I might be able to help you understand the origin of this phrase.