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

what planet is someone on?

BRITISH, INFORMAL
COMMON You can say what planet is someone on? to show that you think someone has crazy ideas or does not know about something that most people know about. What planet are these people on? Do they not read their own headlines? Note: This expression is often varied. For example, you can ask what planet does someone live on? or what planet does someone come from?. He thinks hospitals can make major cuts to their budgets. What planet does he live on? Note: You can also say that someone is on another planet. She was just on another planet, I think. She didn't seem to understand that we are ordinary people.
See also: planet, what

what planet are you on?

used to indicate that someone is out of touch with reality. British informal
See also: planet, what

be on another ˈplanet

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what ˈplanet is somebody on?

(spoken, humorous) used to suggest that somebody’s ideas are not realistic or practical: He can’t really think we’re going to finish the job today, can he? What planet is he on?
See also: another, on, planet