be (living) on another planet

slang To be oblivious to one's surroundings or act strangely. I have no idea what the professor said during today's lecture because I was on another planet the whole time. The millionaire investor always says something wacky in the board meetings—it's like he's on living another planet.

Common Names:

Name	Pronounced	Usage
Michalis	-	Greek
Murchadh	-	Irish, Scottish
Yu	-	Chinese
Amaterasu	-	Far Eastern Mythology
Garry	['gæri]
Lenore	lə-NAWR	English