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1.
An abbreviation meaning Laughing To Myself Quietly
IM user 1: HAHA I can tell funneh jokes!

IM user 2: LTMQ i kno!
by GuitarPlaya December 23, 2005
 
2.
Laughing to Myself Quietly

For use in texting and the like when you are not actually laughing out loud or laughing your ass off. Props to Demetri Martin for pioneering the phrase.
Harold tells a story that is funny but not that funny via AIM.

Louis replies "ltmq"
by What a Becoming Shirt June 11, 2010