English version

somebody is (living) on another planet/what planet is somebody on?

From Longman Dictionary of Contemporary Englishsomebody is (living) on another planet/what planet is somebody on?somebody is (living) on another planet/what planet is somebody on?spokenSTUPID/NOT SENSIBLE used humorously to say that someone’s ideas are not at all practical or sensible He thinks motherhood is glamorous – what planet is he on? planet
Examples from the Corpus
somebody is (living) on another planet/what planet is somebody on?As a replacement for the Bluebird, the Primera is on another planet.People in the Antelope Valley worry that most people south of the mountains think that their valley is on another planet.
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