"LMAO" stands for "laughing my ass off." It is an internet slang abbreviation used in text messages, social media, and online conversations to indicate that something is very funny or hilarious

. It is a stronger expression of laughter compared to "LOL" (laughing out loud) and conveys that the person is laughing hard at something

. The term originated in the early 1990s with the rise of online communication and has since become a common part of internet slang

. While it is widely used in informal contexts, it is not appropriate for formal communication due to the mildly vulgar word "ass" it contains

. People often use "LMAO" to respond to jokes, funny videos, memes, or amusing stories. It can be written in uppercase or lowercase and sometimes with extra letters for emphasis, like "LMAOOOO"

. It can also be pronounced either by spelling out the letters or as a word ("luh-mao")

. In summary, "LMAO" means laughing very hard at something funny, commonly used in casual digital communication to express strong amusement