FS
Flight Simulator. Means the same as MSFS, so Microsoft Flight Simulator
FS9 or MSFS9 means Flight Simulator 9
FSX is Flight Simulator X
FS2002 is Flight Simulator 2002
etc.
1.
A: Hey, what flight simulators you use when you're flying?
B: FS9, X-Plane, Enemy Engaged, LOMAC. And you?

2. Hey, people, someone wants to fly in FS9 through multiplayer today?
by Azazil_6 April 07, 2011
fs
the signature that the unabomber used to sign his letters to victims, and on his manifesto.
Dear Scientist, Your investigation into technology will kill us. FS
by wtcards January 11, 2010
FS
Fat Shagger

(Usually) an unattractive male who loves to hit on heavyweight women.

A high number of FSs live in the UK, near grammar schools.

You can also use the term to make up new nicknames. ('DFS' - 'Dan the Fat Shagger')
OH, SHIT! Look at it! Dan has pulled the FS card again. That chick is massive! He has to explain this tomorrow. Im so dissapointed in him.
by Lodovik October 01, 2009
FS
Freak Stalker; someone who stalks you and wont shut up, on myspace or AIM. They turn into big freaks and stalk you all day.
"ohhh my lord, this FS will not shut the fuck up!"
by Shewanda April 04, 2008
fs
short term for friendster
fs.com/jonasbrothers
fs.com/irveenrocks
by irveen ramirez January 12, 2008
fs
internet abbreviation for fo shizzle
<Jameel> That Keely Hazell is really hot.
<Dan> FS!
by Big*D June 17, 2007
fs
n. short for fat shit
1. You're a fs.

2. Your mom's a fs.
by Batost March 12, 2008

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