It seems to be an American word used when something is so obvious that the person asking sounds stupid, but it's not really used nowadays. You might want to take a look at this thread:
https://forum.wordreference.com/threads/doy.1871852/
Hope it helps!
October 13, 2018
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I think it's the wrong spelling.. is it 'd'oh!'?
But it's just a reaction word like 'wow', 'ah' or something. That's all
October 13, 2018
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Doy = No kidding! (old way to say)
December 4, 2023
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