Definition & Meaning of "LMGDAO" What doeslmgdaomean? View the definition oflmgdaoand all related slang terms containinglmgdaobelow: lmgdao : Laughing My God Damn Ass Off Usage of LMGDAO LMGDAO stands for Laughing My God Damn Ass Off and is an expression used to show intense ...