be on another planet

US /bi ɑn əˈnʌðər ˈplænɪt/
UK /bi ɑn əˈnʌðər ˈplænɪt/
"be on another planet" picture
1.

to be unaware of what is happening around you, often because you are thinking about something else

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He seems to be on another planet today, not paying attention to anything.
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When I tried to talk to her, she just stared blankly, like she was on another planet.
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planetanotherlive to fight another dayone thing leads to anotherhave another think cominga fool knows more in his own house than a wise man in another