x1 is a Smurf [ficitional being] characterized by significant property/feature/trait/aspect/dimension x2 (ka); x1 is/are smurf/smurfing in aspect x2 [corresponds to the undefinable word
From "Les Schtroumpfs" (French). The name was later translated into Dutch as Smurf, which was adopted in English. See also: runcible (=rarnsibe).