Lachoudisch is a near-extinct dialect of German, containing many Hebrew and Yiddish, native to the Bavarian town of Schopfloch. It was created in the sixteenth century (according to some, in order for Jews to keep trade secrets). Few speakers remained after the Holocaust.
Markham, James (10 February 1984). "Dialect of lost Jews lingers in a Bavarian town". The New York Times. New York.