gevaltize
v.— «In certain precincts of the Jewish community, a person who insists that the sky is falling, despite ample evidence to the contrary, is said to gevaltize—a neologism derived from the famous Yiddish cry of shock or alarm.» —“Does Abe Foxman Have an Anti-Anti-Semite Problem?” by James Traub New York Times Jan. 14, 2007. (source: Double-Tongued Dictionary)
Further reading
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