imnsho

from The Free On-line Dictionary of Computing (8 July 2008)

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)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

IMNSHO
       In My Not So Humble / Honest Opinion (slang, Usenet, IRC)