to be on another planet | what planet is somebody on?
成語所屬單字planet
to be on another planet | what planet is somebody on? — 慣用語
1. said, often humorously, when someone seems so far from real life that their idea
1.慣用語
釋義
不切實際；像在外星
said, often humorously, when someone seems so far from real life that their ideas sound wildly impractical.
例句
Dad says a weekend trip with four toddlers is relaxing; what planet is he on?
When the manager cut half the budget, Lina said he was on another planet.