LMK - What does LMK stand for online and in messages?
https://slang.net/meaning/lmk
WebMar 15, 2023 · When you want someone to reply to a message, email, online post, etc., send them "LMK," which stands for "let me know." You can also use it to mean "letting me know," as in "Thx 4 lmk." LMK works as a single statement or part of a sentence. For example, if you need to know a headcount for reservations, you might text your friend, …
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