Definition of la-la land in English:

la-la land

Syllabification: la-la land
Pronunciation: /ˈlälä ˌland
 
/

noun

North American informal
1Los Angeles or Hollywood, especially with regard to the lifestyle and attitudes of those living there or associated with it.
1.1A fanciful state or dreamworld.
More example sentences
  • But anyone who thinks those words are evidence that he was somehow enamoured of the regime is living in la-la land.
  • And anyone who thinks that research can or will be done elsewhere 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.

Origin

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

Definition of la-la land in:

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Pronunciation: ˌɪntəˈniːsʌɪn
adjective
destructive to both sides in a conflict