NK
NK definition by Slang.net
This page explains what the acronym "NK" means. The definition, example, and related terms listed above have been written and compiled by the Slang.net team.
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NK stands for "no kidding," which people may send as a statement to say "I'm serious" or as a question, to say, "Really?" You will most likely see it when texting or messaging online.
People often use NK when the topic they are talking about is shocking. For example, if you text your friend about seeing her ex making out with her BFF, you might follow it up with "NK." Or, if you receive a message about a fantastic deal on a new laptop, you might respond with "NK?"
NK is similar to the NJ and NS (no s***) acronyms. It is also similar to the no cap slang term and srsly abbreviation.