sff 

Science Fiction and Fantasy

sff are the Sci-fi and fantasy genres of movies, games, books, comics, etc.

sff by gearguts March 7, 2015

Sff 

So Fucking funny

Omg Your SFF

Sff by ilollolol June 6, 2009

sff 

Same Fanbase Factor
This relates to the GameFAQs polls where two characters have the same fanbase, such as Zelda/Mario.

HOLY CRAP, Metroid got beat by SFF!

sff by The Cryptic July 26, 2006

SFF 

Sneeze Fetish Forum: an online community for people with a kink for sneezing, also called SF community or just SF.

Dude did you see that post on SFF last night? That hentai girl sneezing on her tits was hot!

SFF by phan-in-the-tardis-at-221b May 20, 2016

Sff 

So Freaking Funny (usually sarcastic)

"Your face looks like a rat, because you have huge teeth!," Josh said.

"Wow. Sff," Jeremy replied.

Sff by Mialynn13 March 28, 2015

sff 

''so fxcking funny''

-hey how was the Hangover?

-SFF!

-would you go out with me?
- HAH, that was sff.

sff by yerAjerk August 8, 2009

sff 

Short hand term used when texting which means Spontaneously Fucking Funny! This term is to be used only when something is quick, witty, and off the cuff. This term is not to be overused! sff puts an lol to shame!

U R sff! It turns me on!:-)

sff by notnicole November 27, 2011