la-la land
Concise Oxford English Dictionary © 2008 Oxford University Press:
la-la land/ˈlɑːlɑːland/
▶noun N. Amer. informal
- 1 Los Angeles or Hollywood, especially with regard to the film and television industry.
- 2 a dreamworld.
– origin la-la, reduplication of LA (i.e. Los Angeles).
'la-la land' also found in these Oxford entries:

