When I started blogging, very often on some comments I read "lol" after a sentence. As always when I don't understand a thing I google ! (which btw is a new verb too) and now I know ! LOL is an acronym for "laughing out loud" or "laugh out loud", and is a common element of Internet slang. But then sometimes I read "LMAO", and had to google again ! When I learned that it meant "laughing my ass off" I decided to rather use "LMPO", which would mean that I laugh my posterior off. I don't have an ass, I am a lady !
LOL was first documented in the Oxford English Dictionary in March 2011. WOW !