A city on the west coast of the US
2. Special Forces
SF is also an acronym used to describe the special forces of the military, whichever one that may be.
Some examples of Special Forces units are:
Navy SEALs (Sea, Air, Land), United States
Army Green Berets, United States
Army Delta Force, United States
SAS (Special Air Service), United Kingdom
Spetsnaz, Russia and Former U.S.S.R
Commandos Marine, France
2. Guy 1: Wow, that guy made it into the SF
Guy 2: Yeah, he must be good
Acronym adjective for the description of the mental density of people (or distinct lack thereof), possibly in a covert manner to your co-workers/friends
2. The SF is so thick you can taste it.