V.E.R.A. -- Virtual Entity of Relevant Acronyms (February 2016):

ROTFLMAO
       Rolling On The Floor Laughing My Ass Off (slang, Usenet, IRC)


The Free On-line Dictionary of Computing (30 December 2018):

ROTFLMAO
ROFLMAO

    Rolling on the floor laughing my ass (arse) off.  An
   extreme form of ROTFL.

   (2000-11-12)