out to lunch
US /aʊt tə lʌntʃ/
UK /aʊt tə lʌntʃ/

1.
tidak fokus, gila, pelik
not paying attention; crazy or eccentric
:
•
He seems a bit out to lunch today, not really following the conversation.
Dia nampak sedikit tidak fokus hari ini, tidak benar-benar mengikuti perbualan.
•
Her ideas are so out to lunch that nobody takes them seriously.
Idea-ideanya sangat pelik sehingga tiada siapa yang mengambilnya serius.