laughing my ass off; laughed my ass off.
IIRCIIRC was normally explained to mean “if I remember correctly.” However, as time went on, it became increasingly defined as “if I recall correctly.”
lamoRead more in this article about some frequently asked questions and fun facts related to our definitions.
Origin of LMAO
from its use in digital communications
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
by 1997, online abbreviation of laughing my ass off. Related: LMFAO (by 2000).
Online Etymology Dictionary, © 2010 Douglas Harper