LMK

LMK

An initialism of "let me know." Used primarily in text messages and online communications to ask for another person for tell or inform one (of or about something). I just emailed you my first draft, LMK what you think. A: "Hey, I'm about to cook dinner. LMK when you'll be home." B: "Should be back by 7."
Farlex Dictionary of Idioms.
See also:
  • YMBJ
  • WTG
  • HBU
  • CTFO
  • DNW
  • DYK
  • YKWIM
  • ianal
  • IANAS
  • IANAD