Is that related to a Pennsylvania Dutch expression?
Possibly? I haven't a clue about most Pennsylvania Dutch customs, to be honest. Something about the idea of narco bunnies made me think of the phrase, which I'm familiar with thanks to Shea and Wilson's
Illuminatus!:
"Weishaupt discovered the Law of Fives while he was stoned and looking at one of those shoggoth pictures you saw in Arkham. He imagined the shoggoth was a rabbit and said, 'du hexen Hase,' which has been preserved as an in-joke by Illuminati agent in Hollywood. It runs through the Bugs Bunny cartoons: 'You wascal wabbit!' But out of that schizzy mixture of hallucination and logomania, Weishaupt saw both the mystic meaning the Five and its pragmatic application as a principal of international espionage, using permutations and combinations that I'll explain when I have a pencil and paper."
- The Eye in the PyramidThe more things change, the more they stay the same and whatnot.