Used to express disdain for something viewed as pretentious.(interjection)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "la-di-da" in a sentence
"I raised my eyebrows, but I may as well have whistled, or said, “Well, la-di-da.”"
"The guy seems to care so little about his work here that he fails to believably: type on a keyboard (re: his character is a professional writer), urgently ride a bicycle in a downpour (again, he does this with inexplicable la-di-da slowness), and talk at a GPS with any semblance of a person who is frustrated."
"Ever la-di-da shitass in this town will be able to spit on us if we take charity!"