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
Lizzie	LIZ-ee	English
Cyrielle	-	French
Kiki	KEE-kee (English), kee-KEE (Greek)	English, German, Greek
Rosendo	-	Spanish
Salacia	-	Roman Mythology
Ekkehardt	E-ke-hahrt	German