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

ROTFL
       Rolling On The Floor Laughing (slang, Usenet, IRC)


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

ROTFL
ROFL

    (Or "ROFL") Rolling on the floor laughing (or rolls...).

   Used in chat, MUD, news.

   See also ROTFLMAO, ROTFLOL.

   (1996-02-22)