How is JK used in casual conversations?

First of all define jk, Just kidding is a  short for JK, and is informally used when someone would like to inject humor into a conversation. The premise of this term is similar to stating, 'I just won a million dollars! Just kidding.' It brightens the chats and adds a friendly touch to conversations. It is an excellent last point for a phrase that could either mean something else or mean nothing at all: "You're awful at this game! Just kidding, you're great!" This word encourages funny replies and could initiate an inside joke for old pals. In short, it adds a pinch of spice to an otherwise bland conversation!