LMAO

LMAO

laughing my ass off; laughed my ass off.

Origin:
from its use in digital communications

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Etymonline
Word Origin & History

lmao
by 1997, online abbreviation of laughing my ass off.
Online Etymology Dictionary, © 2010 Douglas Harper
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FOLDOC
Computing Dictionary

LMAO definition

chat
laughed my ass off. Seen on Compuserve.
(1996-02-04)

The Free On-line Dictionary of Computing, © Denis Howe 2010 http://foldoc.org
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