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.

    ‘the magazine's special Hollywood issue has sent la-la land into a state of apoplexy’
    1. 1.1 A fanciful state or dreamworld.
      ‘he looks like he's in la-la land the whole time’
      • ‘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.’
      • ‘A few minutes later, I dozed off into la-la land.’
      • ‘But anyone who thinks those words are evidence that he was somehow enamoured of the regime is living in la-la land.’
      • ‘Then, he also gave in to the sandman and drifted off to his own la-la land.’
      • ‘Josh was worried; the girl appeared to be off in la-la land again.’
      • ‘Uncle Rick was listening to the talk between the women and Mr. Lewis was off in la-la land.’
      • ‘I smiled, and watched her drift off to la-la land.’
      • ‘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.’
      • ‘So anyone who does not think this is going to turn into a media circus is in la-la land, quite frankly.’
      • ‘He shook his head, quickly bringing himself back from la-la land.’
      • ‘This has allowed the NSC Director to wander off into academic la-la land, taking Bush along with her.’
      • ‘She finally snapped out of la-la land and stood up when she saw me standing there.’
      • ‘We thought you were in la-la land or something!’
      • ‘Their breasts were smeared with a strong but relatively tasteless drug that sent the victims off to la-la land.’
      • ‘She couldn't afford to go off to la-la land while driving.’
      • ‘And I think there were a lot of Democrats before the war who were in la-la land about this national security issue.’
      • ‘And anyone who thinks that research can or will be done elsewhere is living in la-la land.’
      • ‘His dreamy smile faded, and he returned from la-la land.’
      • ‘I was floating off into la-la land when my phone beeped loudly, making me jump.’
      • ‘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.’

Origin

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

Pronunciation

la-la land

/ˈlälä ˌland//ˈlɑlɑ ˌlænd/