lah-di-dah /ˌlɑːdiːˈdɑː/adjective 2exclamation 2forms 2 adjective2 •(UK, disapproving) Of or from the upper class of society. •(UK, disapproving) Affecting upper-class or superior airs.She was all la-di-da, with her nose in the air, and we were all struggling not to laugh because that would be gauche. exclamation2 •(disapproving) Expression of disdain for pretension or haughtiness.Well, lah-di-dah, mister Park Avenue manicure. •(US) Not a care in the world. (used in a sing-song voice, for childhood rhymes) formsmore lah-di-dah · most lah-di-dah