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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
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2
NFS Usually used before or after making a statement (on some funny shit-OSFS)
Yo on some funny shit(OSFS) shaniques weave smells like burnt toast
by FinesseBitch January 21, 2019
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4
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.
I think the O.S.F. has been through here today.

or

The O.S.F. has landed.
by Random Sightings April 16, 2010
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