SF

Special Forces. Used in the military and miltary wannabes.

rick: Dude i wanna be SF when i enlist.
Dude: You're hardcore.

by kilo15 December 28, 2005

SF

SF means Saturated Fat

it can be woman or man, usually fat ugly and full of themselves...literally.
please see third paragraph down on "c dub" for further clarification

yo did you see SF today? she ate my Doritos and drank all the beer and now shes all over my boyfriend!

by ahhhhhhhhhhhhhhhhhhhaha April 5, 2010

SF

Science fiction

Girl: I saw a review, but I don't like SF
Boy: I love SF. Most of it. I hate Star Trek.....

by Soyrua January 2, 2010

SF

shit faced, not san francisco.

That girl was SF. But she was not san francisco.

by DA September 2, 2003

SF

Secretly Fat. Someone who looks great when clothed, but during a hook up, you realize he/she is secretly fat.

After yesterday afternoon's hookup, Chris realized that underneath the sharp looking suits, Todd was actually SF.

by Carlito in Adams Morgan April 18, 2006

SF

Speculative fiction. Includes science fiction and fantasy.

You'll find Star Wars novels in the SF section.

by Damian Yerrick January 29, 2004

SF

Single Female; used in personal adds for someone who accepts people of all races.

SWM seeks SF for BDSM

by the dude of life May 4, 2008