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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 ?
La planete la plus eloignee de l'etoile, baptisee GJ 357d, interesse particulierement les chercheurs, qui estiment qu'elle pourrait etre habitable.
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.
Elle "grouille litteralement de milliards de cometes, de millions d'objets comme Ultima Thule -qui sont appeles planetesimaux, corps celestes a partir desquels les planetes se sont formees- et une poignee de planetes naines de la taille d'un continent, comme Pluton", explique Alan Stern, l'un des responsables de New Horizons.
Le prochain rover de la Nasa sur Mars, baptise Mars 2020, atterrira dans un ancien delta asseche du nom de Jezero, a annonce l'agence spatiale americaine lundi, en quete de traces d'une ancienne vie microbienne sur la planete rouge.
De son cote, le Dr Moulley Charaf Chabou, maitre de conferences a l'universite Ferhat-Abbas (Setif), a presente une conference autour des planetes naines, c'est-a-dire des objets celestes d'une taille intermediaire entre les planetes et les petits corps du systeme solaire, expliquant les caracteristiques qui ont mene a cette classification et les nouveaux projets d'etude dont elles font l'objet au niveau international.
La premiere planete hors du systeme solaire d'une taille comparable a la Terre et sur laquelle l'eau pourrait exister a l'etat liquide, rendant la vie possible, a ete decouverte par une equipe internationale d'astronomes.