what planet are you on?

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
Farlex Dictionary of Idioms.

what planet are you on?

used to indicate that someone is out of touch with reality. British informal
See also: planet, what
Farlex Partner Idioms Dictionary
See also:
  • What planet is (someone) on?
  • what planet is someone on?
  • What planet is (someone) from?
  • What are you on?
  • What color is the sun in your world?
  • go against the flow
  • quit (some place)
  • quit a place
  • never in a month of Sundays
  • think out of the box