Definition of la-la land in US English:

la-la land

noun

North American
informal
  • 1Los Angeles or Hollywood, especially with regard to the lifestyle and attitudes of those living there or associated with it.

    1. 1.1 A fanciful state or dreamworld.
      • ‘And I think there were a lot of Democrats before the war who were in la-la land about this national security issue.’
      • ‘But anyone who thinks those words are evidence that he was somehow enamoured of the regime is living in la-la land.’
      • ‘I stayed with him as they put the little cone over his nose to send him to kitty la-la land and all was well.’
      • ‘No one could concentrate on the book; well, not that they could usually concentrate on something as dull as literature, but they were even more in la-la land that day than any other.’
      • ‘I smiled, and watched her drift off to la-la land.’
      • ‘She finally snapped out of la-la land and stood up when she saw me standing there.’
      • ‘So anyone who does not think this is going to turn into a media circus is in la-la land, quite frankly.’
      • ‘Josh was worried; the girl appeared to be off in la-la land again.’
      • ‘Kids who were in la-la land when we read Claude McKay or listened to Maya Angelou or watched another kid read her poem for the class would suddenly snap to full engaged attention when it was time to read their poems.’
      • ‘Then, he also gave in to the sandman and drifted off to his own la-la land.’
      • ‘He shook his head, quickly bringing himself back from la-la land.’
      • ‘A few minutes later, I dozed off into la-la land.’
      • ‘She couldn't afford to go off to la-la land while driving.’
      • ‘And anyone who thinks that research can or will be done elsewhere is living in la-la land.’
      • ‘This has allowed the NSC Director to wander off into academic la-la land, taking Bush along with her.’
      • ‘Their breasts were smeared with a strong but relatively tasteless drug that sent the victims off to la-la land.’
      • ‘His dreamy smile faded, and he returned from la-la land.’
      • ‘Uncle Rick was listening to the talk between the women and Mr. Lewis was off in la-la land.’
      • ‘We thought you were in la-la land or something!’
      • ‘I was floating off into la-la land when my phone beeped loudly, making me jump.’

Origin

La-la, reduplication of LA (i.e. Los Angeles).

Pronunciation

la-la land

/ˈlälä ˌland//ˈlɑlɑ ˌlænd/