Used by some people when they lose an argument.

If someone sends you this it means that they are done talking and has said what they wanted to say therefore whatever you say after this is disregarded

used to end a conversation rudely. Please don't use it on me ill block you

Another form of writing okay to sound a bit bitchy.

The letter K is often used in texts in an angry or annoyed context. Or that person simply doesn't want to talk to you. The letter K can also be used in a sarcastic way.

What your boyfriend/girlfriend texts you when they want you to feel guilty about something.

what you reply to someone in messaging (instant, text, email, etc.) when you do not want to really reply