What is Lmuo?
1. Acronym for "laughing my underwear off".
2. Used as a smart substitute for "laughing my a$$ off". After all, where would you be without your a$$?
3. Usually used in instant messaging, lmuo is used to indicate laughter. See also
4. May be written as "lmfuo" to indicate extreme amusement. See
Joe: OMG, chelsea walked into a door!