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LMK stands for “Let Me Know.” It is a typical texting shortcut when one wants to know about something, give an update, or get a reply. It is used in informal communications and emails and in social media messages. In a typical instance, one would say, LMK, are you free tonight, i.e., they would like you to tell them whether you are available or not. The abbreviation not only saves time during typing but also helps in maintaining a simple conversation and is therefore mostly used by teenagers and those who use their smartphones most of the time. Know more about lmk meaning in text