Definition of la-la land noun from the Oxford Advanced American Dictionary

 

la-la land

 noun
noun
NAmE//ˈlɑ lɑ ˌlænd//
 
[uncountable](informal)(disapproving)
 
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if you say that someone is living in la-la land, you mean that they do not understand what a situation is really like, but think it is much better than it is
See the Oxford Advanced Learner's Dictionary entry: la-la land