They type of okay you say when you are at that point of no bother with someone who has no common sense and you really want to punch them in the face but your a pacifist so you have to express with a really rude sounding word.
Y'okayy
Whenever someone is feeling really laid-back and they just don't give a shit about what is going on. Or, they just want to rifle off a quick text message response because they have plenty of other things to do with their life. Very sarcastic.
girl: "You are such a fucking douche."
me: "Yokay. I'm gonna go fuck mad slam pieces."