LQTM

LQTM

slang An initialism of "laughing quietly to myself," used in text messages and online communication to indicate one's mild amusement with someone or something. Often spelled with lowercase letters. I'm still LQTM over that funny picture you texted me yesterday. The show is pretty funny. It didn't make literally LOL or anything, I mostly just lqtm throughout.
Farlex Dictionary of Idioms.
See also:
  • WTG
  • HBU
  • YMBJ
  • CTFO
  • FOAD
  • YKWIM
  • FTS
  • ggwp
  • ggez
  • AINEC