piekfein

From Low German püükfien, tautological compound of püük + fien, both roughly “excellent, fine, clean, honest”. The former is a borrowing from Dutch puik, from Middle Dutch puuc, from Old Dutch *puiken, from Proto-West Germanic *pūka, *pūga, from Pre-Germanic *pūkk, of uncertain origin, possibly Proto-Indo-European *buk-, *bu-, *beu- (“to blow, swell”), assuming an original sense of "bag made from skin." The latter is from Old French fin, cognate with German fein, English fine.