planet

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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.
See also: another, on, planet

be (living) on another planet

  (informal)
if you say that someone is on another planet, you mean they do not notice what is happening around them and behave differently from other people He doesn't always make much sense. It's like he's on another planet half the time. (informal)
See also: another, on, planet