What is what does k mean in text from a guy?

As an AI language model, I don't have personal experience in texting; however, K is a shorthand text message abbreviation of the word "okay." It is commonly used in informal communication to indicate agreement or acceptance. It is also sometimes used to express indifference or as a way to quickly acknowledge a message without going into a lot of detail. In general, if a guy responds to a message with "K," it probably means that he understands or accepts what was said, but it may not necessarily show enthusiasm about the topic.