Everyone knows that our math teacher is out to lunch

English as a Second Language English Vocabulary, Grammar and Idioms
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Everyone knows that our math teacher is out to lunch. (*) behaves in a crazy manner (*) went to have lunch early (*) is not here because he's having lunch

This is a companion discussion topic for the original entry at https://english.best/questions/24024,everyone-knows-that-our-math-teacher-uis-out-to-lunchu/
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I know that ‘out to lunch’ means ‘behaving in a crazy manner’ because I learned the phrase from the song ‘Sweet as the Punch’ by the Bloodhound Gang. Here is part of the lyrics:

Every time I think that I’m the only one who’s lonely
Someone calls on me
And every now and then I spend my time in rhyme and verse
And curse those faults in me
And then along comes Mary
Then along comes Mary
And does she want to give me kicks , and be my steady chick
And give me pick of memories
Or maybe rather gather tales of all the fails and tribulations
No one ever sees
When we met I was sure out to lunch
Now my empty cup tastes as sweet as the punch

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