What is "Oki-doki" or "Oki-dokie" or "Okay-dokay"

It's rhyming reduplication and the usual spelling is okey-dokey (see the accepted answer in that question). – Andrew Leach

I think it's a moot question, really. The etymology of the term is disputed, however, current usage is invariably synonymous with the adjective 'alright'.

I recommend using 'alright', 'satisfactory' or another 'grown-up' equivalent in formal or academic settings, 'okay' in informal or dubious communicative spheres, and owt you fucking like in those circles where you can get away with it.

Okie-diddle-dokie?

Years ago, when I was a child growing up in my homestate of Louisiana, there was a man running for the position of governor. He went by his initials, which were O.K. Allen. Somehow, people started spelling his name, "Okay." and over the years it stuck. "Okay Dokay" is just the slang way.