The response after you've been unloaded on emotionally by your significant other during a passionate and heated argument and have nothing further to say. Its said with the underlying message " Think/Say what you want, if that's how you feel ". Chances are it conveys the message that
whatever you just said isn't true, or you
don't have all the facts straight, but ok.
Some use it as a way to blow you off, show their lack of concern and to intentionally upset you.
When a man says ok, he can
mean " Think what you want " or " Say what you want.". He can also
mean he's fed up with
whatever is being brought to his attention and no longer is interested in arguing about it.
When a woman says ok, she means " I'll show you. " or she too is done and fed up with the situation brought to her.