Urban slang from Amsterdam also used in Australia to say ok in a more friedly way. Used to say ok to child as Willy Wonka in the movie Charlie and the Chocolate Factory.
Often used against that anoying kid who write you all the time because he want you to think he is cool it is used as a "i don't care about your shitty life, go talk to your grandma so she can compliment you" or "i don't like you, stop talking to me"
Over snapchat...
Richard: i was at the waterpark today it was so much fun
Me: okidoki
*2 hours latarrrrr*
Richard: so are you going somewhere tonight?
Me: yea to kristian's party
Richard: can i join bro?
Me: i don't think he want it we are already a lot of people Richard: plsss come on dude Me: okaay you can come (even tho i don't want to)