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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?

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!
See also: planet, what

what planet is someone on?

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, someone, 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


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
References in periodicals archive ?
Cette estimation resulte d'une nouvelle analyse des donnees recueillies par le telescope spatial americain Kepler, lance en 2009 pour rechercher un type precis de planetes hors de notre systeme solaire appelees exoplanetes.
Pour etre habitable, une planete doit etre a une distance de son etoile permettant des temperatures a sa surface ni trop chaudes ni trop froides pour que l'eau puisse exister a l'etat liquide et oE la vie serait possible.
Les trois nouvelles planetes ont egalement la particularite de graviter autour d'une etoile dite [beaucoup moins que]naine[beaucoup plus grand que], baptisee Trappist-1.
400 annees-lumiere de la Terre, elle a oblige les astronomes a utiliser la "methode des transits", une technique permettant de detecter des planetes lointaines lorsque celles-ci passent entre la Terre et le disque de leur etoile.
Une caracteristique singuliere qui n'est pas sans rappeler Tatouine, la planete aux deux soleils imaginee par George Lucas dans la saga Star Wars.