That's a slang term, along with Saupreiß, the southern Germans (Bavarians) use for the northern Germans (former Prussians).
I think the Austrians may use Piefke for all Germans. Saupreiß is used more by the Bavarians.
“Hier in Bayern gibt’s kein Rasenhass, du Saupreiss, du.”
That one I know - never heard the other.
I think the Austrians may use Piefke for all Germans. Saupreiß is used more by the Bavarians.