LOL
» LOL, an abbreviation for laughing out loud, or laugh out loud, is a common element of Internet slang. It was used historically on Usenet but is now widespread in other forms of computer-mediated communication, and even face-to-face communication. It is one of many initialisms for expressing bodily reactions, in particular laughter, as text, including initialisms for more emphatic expressions of laughter such as LMAO my ass off"), and ROTFL or ROFL on the floor laughing"). Other unrelated expansions include the now mostly historical "lots of luck" or "lots of love" used in letter-writing.