lm (留名 lau4 meng2) is the abbreviation of a romanised pronunciation of Hong Kong internet slang. Its direct translation is to leave (one's) name. Widely used in the comment sections of LIHKG (a multi-category forum website based in Hong Kong) to follow up/mark on a post of interest.
*Post*

*Comment*
麵神:lm
by spectre_1223 March 15, 2022
Get the LM mug.
Let me see
Friend 1-This dress is so cute!
Friend 2-Omg lms
by luciferismydaddy May 24, 2017
Get the Lms mug.
it’s a short term for “let me stop
kim: omg i’m so ugly right now
Kimberly: you are every day lol lms}
by nyny1222 October 15, 2019
Get the lms mug.
Miguel: Stop playing before I actually do🤣lms😭
by Kitcat31 January 1, 2020
Get the Lms mug.
Let me see
Omg! Did you buy the car you told me about? Lms!
by Carlosenriquerg July 16, 2015
Get the Lms mug.
let me see
person 1: i just got some bomb ass makeup

person 2: lms
by ssincerelymee January 18, 2018
Get the lms mug.
One meaning for "LMS" is an acronym for like my status, which can be used in one of the many recent Facebook trends where someone will post something (specified in the status) to your wall if you like their status.
LMS and ill make up a lie about you to improve your confidence
by nightlifecommando January 20, 2011
Get the LMS mug.