@Yvonne Smith I've seen it online as well. As a person who grew up in the rural south, I can honestly say I have never ever seen that particular hand gesture as meaning anything but OK.
I probably use OK mostly for agreement with something previously said. I also use Okay. And, I live in OK and that's ok once you get used to it. And, there's more, if that's ok. I used to play jacks with my kids especially my daughter.
Officer: I need your driver’s license. Driver: Okee Dokee Artichokee Officer: Cut out the wise cracks Driver: Okee Dokee Smokey
A more likely explanation is that the term originated as an abbreviation of orl korrekt , a jokey misspelling of 'all correct' which was current in the US in the 1830s.
What about Okey Dokey as allot of Aussie say in preference to OK https://www.collinsdictionary.com/dictionary/english/okey-dokey