This is an acronym meaning “fucking fantastic” or “fucking fascinating”, depending on the context. Both can be used literally or sarcastically.
Usage 1: Well ain’t that just FF, we have to start all over again!!!

Usage 2: Omg, that is FF, I never knew that about anthropology!
by LingDanc803 February 1, 2023
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An acronym for forever flat (breast)
She will all ways be
FF
by Duane427 August 4, 2019
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jack: when will people learn the meaning of ffs
bob: i agree for fuck sake people keep asking
by loltehrealpawnd November 12, 2011
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Jack was a total ass slut; he liked nothing better than being fist-fucked
by Homo Simpson July 27, 2003
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Facial Feminization Surgery; used by male to female transsexuals
I want FFS so I can be seen as who I am
by Transgirl December 13, 2004
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