a-di-da, lah-di-dah [informal] [dated] - (esp. of a woman's speech or manner) not sincere because the person is pretending to belong to a higher social classa la-di-da voice/mannerShe's so la-di-da - I can't stand her!
L
Meaning of L in English
Cambridge English vocab. Кембриджский английский словарь. 2012