"Lmao" stands for "laughing my ass off." It is an internet slang term used in text messages and online communication to express amusement or laughter. People often use it to indicate that something is very funny or to lighten the mood in a conversation. This abbreviation is part of a larger set of acronyms commonly used in digital communication, such as LOL (laugh out loud) and ROFL (rolling on the floor laughing). These terms have become popular in social media, gaming, and texting, allowing users to convey emotions quickly and efficiently.