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1855, of uncertain origin. Earliest records of it are in San Francisco and Sacramento, California, U.S. Suggestions include Spanish chanada, a shortened form of charranada "trick, deceit;" or, less likely, German Schenigelei, peddler's argot for "work, craft," or the related German slang verb schinäglen. Another guess centers on Irish sionnach "fox."
[ultimately probably fr Yiddish shlim mazel, ''rotten luck,'' hence ''a difficulty or misfortune,'' and related to shlemazel]