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
Fanny	FAN-ee (English)	English, French, Spanish
Erminia	-	Italian
RandÚLfr	-	Ancient Scandinavian
Mattan	-	Biblical, Biblical Hebrew
ÖDi	-	Hungarian
Britton	['britən]