Not a blasted thing! The "dokie" part is just a rhyme to make the saying sound cuter - it really does not mean anything at all except OK, which means "everything is fine."
Oklahoma
It comes from your buthole
"Okie dokie" derives from "OK" which is an American expression (now used internationally) to mean "alright", "good" or "yes".
Rhyming take-off on Okay [OK].