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la-di-da

1. adjective Pretentiously snobbish or elitist. I'd rather not go to some la-di-da restaurant and get overpriced rabbit food. Let's just get pizza.
2. interjection A sarcastic and derisive phrase meant to mock what one perceives as pretentious or overly refined. Well, la-di-da, look at Mr. Fancy in his new suit. Wow, you were on student council? La-di-da!

lah-di-dah

(ˈlɑˈdiˈdɑ)
1. mod. casual; relaxed and uncaring. She’s not all that calm about her possessions, but she is very lah-di-dah with men.
2. interj. a jeer; a mocking response. So you have a new car! Well, lah-di-dah.