A casual, friendly way of saying yes or expressing agreement, often used to show enthusiasm.
A reduplication of 'okey' or 'okay,' which comes from American slang. The 'dokey' part was added for rhythm and playfulness, following a pattern of doubling words seen in English colloquialisms.
Okey-dokey is one of those words that seems silly but actually reveals how English speakers love to play with sounds—compare it to 'hokey-pokey' and 'malarkey'! The original 'okay' is itself mysterious, possibly from Choctaw 'okeh' or a playful way to say 'O.K.' (all correct).
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