- (British English cloud cuckoo land)(disapproving)
if you say that somebody 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 幻想世界；脱离现实的幻境 Los Angeles or Hollywood, especially with regard to the film and television industry
Word Originla-la, reduplication of LA (i.e. Los Angeles).