use by adult "entertainers" like escorts for male to female transgender hosts, usually preceeded by a number representing lengh of penis ex: 8 ff or FF - 8" fully functional
by staroflife February 24, 2009
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An acronym for "For fuck's sake", meaning "I can't believe this shit, I demand you to stop"

The source is For Christ's sake ("in Christ's name please explain/stop that"). Swap in Fuck All ("nothing") for the deity, and you get an urban, angry, non-religious, expletive, demanding equivalent of "Oh My God, do something".
1. For fuck's sake, where did you get that godawful haircut?
2. FFS, I've explained it to you five times already. Now STFU!
by HJJBrig January 14, 2014
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FF means many things, some already said, I might (most likely will) repeat.
#1. Fist fucking- the act of stuffing a fist up a pussy *owch*
#2. Foot fucking- a type of masturbation that women do to their male partners dick.
#3. Final fantasy- a game played by geeks, such as my boyfriend, that I should probably learn to play.
#4. Fan Fiction- a type of writing that uses already made characters from books and movies and such that have sex, also called slash... gay LOTR ones at www.libraryofmoria.com.
#5. Father fucker- a person who likes to fuck their dad/friend's dad.
#6. Fucking freak- ... me...
I think I've made myself clear.
by MizMilenko May 28, 2004
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We should ff at 20. In the game League of Legends, it means that we should surrender at the minute 20.
by aafenlared August 17, 2015
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What would a gay man be with out his fabulous FF?
by LADYDTK October 22, 2010
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Stocking fetishist abbreviation for old-fashioned stockings from the 40's and 50's that are knitted flat and sewn together leaving a distinctive back seam. Authentic full fashioned stockings also have a top welt made by doubling the fabric over and sewn with a small hole in the back seam called a "finishing hole".

Look, it matters to you if it matters.
"Hi, baby, are you wearing your FF stockings and your CFM pumps? I'll be right over for a little soft-core CBT..."
by Axel von Auersperg August 24, 2005
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