As you have read, it means Laughing My Ass Off, but what has NOT been explained is the origin. Laughing is supposed to be the
best medicine, but it is also the
best exercise. Well, behind sex and walking. Anyways, if you
laugh, you lose weight, hence laughing your ass off.
Sara- I LMAO-ed so much last night I think I lost weight! Thanks so much sweetie!
Joe- Ya, I was hoping you would.
Sara- *GASP* *
SLAP* WE ARE THROUGH!
Joe- I was jk!!!!!! LMAO
Sara- NOT
FUNNY JOE!
Joe- *snickers*
Sara- I hate you.
Joe- Wanna do it? You'll lose those last 5 pounds...
Sara- ....
Fine. But JUST this once!