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rude slang An initialism of "laughing my nuts off," primarily in text messages and online communications to indicate that one thinks that something is extremely funny or ridiculous. Often spelled in lowercase letters. I just saw a monkey riding on the back of a pig! #lmno Haha I'm still LMNO over what Tom did yesterday.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.