kk
Used to say "I'm not interesting in conversing with you any more, and I don't like associating with you but feel socially compelled to not hurt your feelings, but please just go away"
You: Hey man, you'll never guess what just happened!! I just got front row tickets for Iron maiden!!!
Them: kk

You: I have it, it's an oyster with two tickets to that thing you love!
Them: kk