interj. laughing out loud. (Indicates that one is laughing in response to a previous remark. Used in electronic mail and computer forum or news group messages. Not pronounced aloud.) : I'm LOL about the last remark you made.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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LOL definition
chat "laughing out loud", or "lots of love" or "luck". (2003-07-29)