Polonia / what did he call him? german slur against poles? [8]

i know two poles at work, and a german. yesterday one of the poles and the german got into a big fight. i asked the other pole what had happened, and he said the german had called the pole a german anti-polish slur, but I didn't hear what it was...

what would he have called him? i looked it up but I couldn't find any german slurs. do the germans have any specific anti-polish slurs or was it just something generic?