LMAO

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