A keyboard misspelling(typo) from the acronym "ROFL" which means "Rolling On The Floor Laughing". It isn't used very often,in fact it is barely used by people on the internet,sometimes unwillingly.
Example:
Joe15: My dad woke me up so early this morning,I could barely stand.
Mike124: RIOFL
Joe15: What?!
Mike124: ROFL*
Joe15: Oh :)
by Ned-suki September 29, 2007