What does LMAO stand for?

MLA style: "LMAO." Acronym Finder . 2013. AcronymFinder.com 21 May. 2013 http://www.acronymfinder.com/Laughing-My-Arteries-Out!-(LMAO).html
Chicago style: Acronym Finder . S.v. "LMAO." Retrieved May 21 2013 from http://www.acronymfinder.com/Laughing-My-Arteries-Out!-(LMAO).html
APA style: LMAO. (n.d.) Acronym Finder. (2013). Retrieved May 21 2013 from http://www.acronymfinder.com/Laughing-My-Arteries-Out!-(LMAO).html

Laughing My Arteries Out!

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Lymphomas of Mucosa Associated Lymphoid Tissue Leave Me A Message Left Message on Answering Machine Lethal Miniature Aerial Munition System (US Air Force) Lateral Magnocellular Nucleus of the Anterior Neostriatum Land Mail Art Objects Laugh(ing) My Ass Off Laughing My Ankles Off Laughing My Apples Off Laughing My Arms Off		Leave Me Alone, Okay? Lick Me All Over Living My Adventism Out (est. 2008) Laughing My Ass Off On The Floor Laughing My Ass Off Peeing Laughing My Ass Off, Peeing In My Boots Laughing My Ass Off, Peeing In My Pants Laughing My Ass Off Peeing In My Pants Rolling On the Floor Laughing My Ass Off With Tears In My Eyes Laughing My Ass Off, Peeing My Pants (Internet slang) Laughing My Ass Off Rolling On Floor