abbreviation for Obersturmbannführer; A nazi party rank used by the SS and SA in the second world war
All hail the OSF
by Her Kommisar March 06, 2011
Referring to the One Star Fairy in the CBS forums. An O.S.F. is a Phaenomenon occurence in which every post is rated 1 star out of a possible 5. There is no actual member who is the O.S.F. it is just a speculated phantom. It is mainly associated in the NCIS forums.
by Random Sightings April 16, 2010
That OSF is useless!
by scarls June 28, 2012
by cmac44 February 12, 2007
by exus345 July 10, 2008