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la-di-da (interj.)

mocking affected gentility, 1874, a derisive imitation of the "swell" way of talking. Compare lardy-dardy (1859).

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Definitions of la-di-da from WordNet

la-di-da (adj.)
affectedly genteel;
Synonyms: grandiose / hifalutin / highfalutin / highfaluting / hoity-toity
From wordnet.princeton.edu