ffi

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.

by Zyfo May 4, 2006

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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*

by no that is not a disease January 3, 2021

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