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.
My Very Easy Method Just Speeds Up Naming Planets
A mnemonic device for remembering the names of the eight planets, Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune, as well as the dwarf planet Pluto. (The phrase was in use before Pluto had ceased to be considered a true planet.) A: "Let's see, there's Mercury, um… Earth, Mars… Uranus… dang, I can never remember all the planets' names!" B: "Well, try to remember this—My Very Easy Method Just Speeds Up Naming Planets." A: "Hey, Pluto isn't a planet anymore!"
What planet is (someone) from?
That is an absurd or stupid thing to think or do; what is someone thinking? (Implies that someone would only do or think that if they were an alien from another planet.) A: "I think they should just do away with taxes altogether!" B: "What planet are you from? Taxes pay for hospitals, roads, our military—literally everything on which our society is built." What planet is he from? He could get someone killed driving that speed along a residential road!
What planet is (someone) on?
What are you thinking? That is an absurd or stupid thing to think or do. (Implies that someone would only do or think that if they were an alien from another planet.) A: "I think they should just do away with taxes altogether!" B: "What planet are you on? Taxes pay for hospitals, roads, our military—literally everything on which our society is built." What planet is he on? He could get someone killed driving that speed along a residential road!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
what planet is someone on?
BRITISH, INFORMALCOMMON 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.
Collins COBUILD Idioms Dictionary, 3rd ed. © HarperCollins Publishers 2012
what planet are you on?
used to indicate that someone is out of touch with reality. British informalFarlex Partner Idioms Dictionary © Farlex 2017
be on another ˈplanet
,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?Farlex Partner Idioms Dictionary © Farlex 2017