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fatal familial insomnia (ffi) 

something that literally traumatized the haikyuu fandom forever. its a rare disorder that affects the part of your brain that controls the sleeping cycle. patients usually die from it within year or two. something used in a bokuaka fanfiction, (bokuto x akaashi) and it killed akaashi's lover forever and now we're all emotionally numb
person: hey whats fatal familial insomnia (ffi) ?
yes, it means fatal familial insomnia and that means an illness that kills you overtime from weight loss, dementia, and sleep deprivation basically.

*crying noises*
Related Words
A common acronym that is used to say "For the Fun of It" in a fast way.
Harry: What was that good for?
Dennis: Just ffi.
ffi by Zyfo May 4, 2006
FFI is short for Finger Flip Inc, a fingerboard forum. Even though it is a fingerboard forum people go there to get into fights about every little thing(mostly non fingerboard related). Also a place were everyone likes to suck up to the FlatFace team and get on there good side just because they are better than most(even though some of the team sucks) of us that makes them superior to most. But there is still a lot of cool people on ffi that aren't cocky or complete dumbasses and fingerboard just to fingerboard.

fingerflipinc.com/forum
Joe: Hey look at this thread in chit chat
Bob: What? Another fight?
Joe: How did you know?
Bob: It's ffi.
FFI by Iistheman July 20, 2009
they are ffi
FFI by alfjasi November 24, 2010
Fatal Familial Insomnia- I can't get passed stage one sleep and its slowly turns your brain into mashed potatoes it really sucks. its rare though
If you know somebody in your family has FFI seek medical attention immediately
FFI by hoodexperience May 31, 2010
Finger Flip Inc. A fingerboard forum were all the cool techdeckers go.
Jim: I want to be cool.
Bill: Go to ffi.
FFI by George W. Hairy Bush December 24, 2008