la-la land /ˈlɑːˌlɑː-/ noun Learner's definition of LA-LA LAND
[noncount] informal
1
: the mental state of someone who is not aware of what is really happening幻想；虚幻、脱离现实的精神状态—
usually used in the phrase in la-la land通常用于短语in la-la land -
I tried to talk to him, but he was off in la-la land.我试着跟他说话，可他早心不在焉了。
-
If that's what she thinks, she's living in la-la land.假如她是那么想的，那么她就是生活在虚幻的世界里。
— called also (British) cloud-cuckoo-land
2
La-La Land —
used as a nickname for Los Angeles, California用作加利福尼亚州洛杉矶市的昵称