la-di-dala-di-da, lah-di-dah /ˌlɑː diː ˈdɑː/ adjective informal 
used to describe someone’s behaviour when you think they are talking and behaving as if they consider themselves better than other people SYN snobbish: 
a la-di-da attitude
used to describe someone’s behaviour when you think they are talking and behaving as if they consider themselves better than other people SYN snobbish: a la-di-da attitude