LMK in Snapchat is an abbreviation for "Let Me Know."
This acronym is commonly used in chat and texting conversations, including those on Snapchat, to encourage the recipient to provide information or feedback. The capitalization of the letters (LMK, lmk, Lmk, etc.) doesn't change its meaning.
For example, you might use LMK in a Snapchat message like this: "What time are we meeting up later? LMK!" This asks the other person to tell you the meeting time.
Essentially, LMK is a quick and convenient way to ask someone to keep you informed.
