Many of the users use the JK term or slang in their conversation, but they don't know the correct meaning or how to reply to JK. Alright, don't worry. As you know, the context is very light and casual to anyone. Then, the reply to this term is not a big deal at all. But make sure to reply within the same context that you could get from others. Never return offensive or heartbroken words to others, even if they make such mistakes. Try to understand the cause and help them clear the issue behind their talking.
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https://radarro.com/what-does-jk-mean
