1) A hasty way to end a conversation.
2) Officially an abbrieviation of 'Ok, thank you, bye.'
3) Most commonly used sarcastically after an insult to try and make it sound jokey (it usually isn't...)
Guy: Hey, d'you remember that guy you pulled last night? You know! The vertically challenged asthmatic one with a glandular disorder?
Girl: Hey, d'you fancy shutting the fuck up now? kthnxbai!
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