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The definition of meshugas is a Yiddish word for nonsense or craziness. Crazy or inappropriate behavior is an example of something that would be described asmeshugas.
Nevertheless, many yiddish words entered the modern German language, like die Chuzpe (chutzpah) or meschugge (crazy). Also, some German words in American English were imported through Yiddish, like schwitz (to sweat) or Schmuck.