Lmao (in text messages) usually stands for laughing my ass off.
Person1:OMG did u see how mr Pierson slipped today
Person2:yeah lmao
When you're name is Bryan Lemus and you ask out a girl and she says "no lmao" aka she doesn't like you dawg, you are fucked.
Juan "Would you ever wife up Bryan Lemus?"
Dulce "no lmao"
Lettuce mayonnaise and onions.
Commonly used while ordering food.
McDonald's worker: can I take your order
Jeremy: double cheeze burger with LMAO
McDonald's worker: whats funny
girl: onii-chan can you help me?
boy: nah im too tired
girl: lmao, now!
boy: ok if you insist