A casual, enthusiastic way to say 'okay' or to agree with something in a friendly manner.
From 'okay' (itself from disputed origins, possibly Choctaw 'okeh') plus '-doke' (reduplicative suffix for emphasis), popularized in early 20th century American slang.
The '-doke' addition is pure American playfulness—we took an already casual word and made it bouncier, which is why it feels so nostalgic and old-fashioned now, like something from a 1950s cartoon.
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