In order to attain maximum effect, delivery of 'okay bye' must be extremely quick followed by immediate hang up/departure. When emailing, 'okay bye' should be spelt as one word -okaybye- to indicate the hasty delivery usually employed when speaking.
Max: Good call. Okaybye. *leaves room instantly*
Girl: OKAYBYE! No I don't
Girl 1: " Did you see that girls camel toe?!"
Girl 2: "Yeah and i was like OKAY BYE!"