la-di-da /ˌlɑːdɪˈdɑː 
/ (also lah-di-dah or la-de-da) ▸ adjective informal pretentious or snobbish in manner or speech: do I really sound like a la-di-da society lawyer?.
– ORIGIN mid 19th century (as a noun): imitative of an affected manner of speech.
EnglishOxford Dictionary of English
