la-di-da
adjective old-fashioned informal (also lah-di-dah) uk/ˌlɑː.diˈdɑː/ us/ˌlɑː.diˈdɑː/
（尤指女人）故作清高的，装模作样的，做作的
used to describe speech or behaviour that is not sincere because the person is pretending to belong to a higher social class
Synonyms: highfalutin hoity-toity