rolling/rolled on the floor laughing: written in response to something very funny.
Origin of ROFL
from its use in digital communications
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
rolling on the floor laughing
rolling on floor laughing
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
by 1993, online chat abbreviation for rolling on the floor laughing.
Online Etymology Dictionary, © 2010 Douglas Harper