out to lunch
Adjective
  1. Away eating lunch or for a midday break; especially, away from work or a job.
    She's out to lunch right now, but you may leave her a note.
  2. (idiomatic, informal) Clueless, inattentive, or careless.
    After he drove with his turn signal on for five miles, I was pretty sure he was out to lunch.



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