DuckCorp Dico

Found one definition

1.                 From The Free On-line Dictionary of Computing (19 January 2023):
                   
   
   
                   
                     
   IMHO
   IMAO
   IMNSHO
   IMO
      <chat> (From SF fandom via Usenet) In My Humble Opinion.
      Also seen in variant forms such as IMO, IMNSHO (In My
      Not-So-Humble Opinion) and IMAO (In My Arrogant Opinion).
      [Jargon File]
      (1998-09-24)