Lol!

LOL, or lol, is an acronym for "laughing out loud", and a popular element of Internet slang, which can be used to indicate amusement. It was first used almost exclusively on Usenet, but has since become widespread in other forms of computer-mediated communication and even face-to-face communication. It is one of many acronyms for expressing bodily reactions, in particular laughter, as text, including acronyms for more emphatic expressions of laughter such as LMAO and ROFL or ROTFL.