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LMAO

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  1. laughing my ass off; laughed my ass off.

Origin of LMAO

from its use in digital communications
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Word Origin and History for lmao

LMAO

by 1997, online abbreviation of laughing my ass off. Related: LMFAO (by 2000).

Online Etymology Dictionary, © 2010 Douglas Harper