köken: An originally Central and Low German word from Middle Low German mül (“dust”) and Middle High German mülle, from Old High German mulli (“waste, rubbish”), a nominal formation from mullen (“to crush, grind”), from Proto-Germanic *muljaną (“to crush”) (DWDS).
köken: From porco + -aria. Compare Spanish porquería, Catalan porqueria, cf. also Romanian porcărie and Italian porcheria. Piecewise doublet of porqueira.