The term either refers to Hollywood, Los Angeles or a state of mind synonymous with Hollywood that is out of touch with reality, focusing on dreams, fantasies or frivolous endeavors.
That sounds like an idea from la la land.
She's been living in la la land too long.
To be zoned out or spaced out. To be in a sort of semi-concious state until snapped out of it. Usually by a slap across the face or a hand waving around in front of your eyes.
1. Everyone loves to live in that La La Land.
2. Uh-oh, she's off to la la land again.
3. "I am confident, but I still have my moments.
Baby, that's just me,"