What is the X in X-mas?
1904, shortening of wienerwurst (1889), from German Wiener "of Vienna" (from Wien "Vienna," from Latin Vindo-bona, from Gaulish vindo-, from Celt. vindo- "white;" cf. Old Irish find, Welsh gwyn "white;" see Gwendolyn) + Wurst "sausage." Clipped form wienie is attested from 1911. Extensive pejorative senses developed from its penis-like shape.