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2.
Laughing My god-damned motherfucking ass off. An internet abbrev. used only by complete n00bs.
Normal Person: lmao
faggy newb: lmgdmfao
by Aa'lok Etec January 12, 2004
 
1.
Abbreviation for the term Laughing My God Damn Mother Fucking Ass Off. Often used online when one can't be bothered to actually say it all.
person1: I fell off my bike today and twisted my ankle
person2: L.M.G.D.M.F.A.O.
by Deans_babi_gurl August 23, 2005