la-di-da

[[t]lɑ͟ː di dɑ͟ː[/t]]

also lah-di-dah

ADJ-GRADED (disapproval)

If you describe someone as la-di-da, you mean that they have an upper-class way of behaving, which you think seems unnatural and is only done to impress people. [OLD-FASHIONED]

I wouldn't trust them in spite of all their la-di-da manners.