la-la land
1. Los Angeles, California (often abbreviated L.A.). This expression pokes fun at the alleged eccentricities of the city's inhabitants. For example, What do you expect? Frederick has lived in la-la land for ten years and it has rubbed off on him . [Slang; c. 1980]
2. A state of being out of touch with reality, as in
I don't know what's going on with Amy-she seems to be in la-la land. [
Slang; c. 1980] Also see
cloud-cuckoo land;
never-never land.