Although it is not exactly clear, where the rhyme was created, its roots go back to the 1930’s, when Okie Dokie started appearing in slang as an extended version of O.K.
The first documented case of the phrase “Okie dokie artichokie” dates back to 1988 and it started gaining a wider popularity in the 1990’s.
One of the biggest boosters of the popularity of “Okie dokie artichokie” was Hillary Rodham Clinton who used the phrase to finish staff meetings, in a similarly cringy fashion to the Pokémon GO to the Polls.
Since then, the expression has seen moderate use, not too viral, however widely recognized and used around the United States.
It was first defined on Urban Dictionary on September 3, 2004, as Okay Dokey Artichokey and was swiftly followed by an “Okie Dokie Artichokie” on September 7th.