What does JK mean in text messages?

what is j k? it is "just kidding." It's a note to indicate that something said before was not to be taken seriously, or that it was meant as a joke. What is JK used for? People use it for somewhat random texting, chatting, and social media so that people won't misunderstand it. Such as "I ate the last part of your cake. JK!" That means he really ate it, but he's just kidding. The usage of JK tends to ensure that the other one is aware of the fact that you are not serious.