la-di-da

1. adjective

Disdainful description of pretension or haughtiness.

She was all la-di-da, with her nose in the air, and were all struggling not to laugh because that would be gauche.

2. interjection

Expression of disdain for pretension or haughtiness.

"Well la-di-da, arent you the impressive personage, with a feather in your hair yet."