What does lmao stand for Laughing My Ass Off. It’s an acronym used primarily in texting and online communication to express extreme amusement or laughter. This acronym has become a ubiquitous part of internet slang and is often used to convey humor or amusement in a casual manner. So, next time you see «LMAO» in a chat or social media post, you’ll know it’s an expression of someone finding something hilarious.