Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: Copying the speech of upper-class people

la-di-da

 adjective
     
la-di-da , la-di-dah informal
used to describe someone's behaviour when you think they are talking and behaving as if they consider themselves better than other people [= snobbish]:
a la-di-da attitude
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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