FS are the tags for a popular online clan of the MMORPG game Runescape. It is owned by P0ke N Die2 and has proven to be one of the strongest pure clans alive. The website is www.fearless.ipbfree.com
Omg dude did you see FS poon IR last night? I mean I haven't seen pooning like that since world war 2!
by youllneverfindout December 31, 2008
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Guy 1: Wanna go to that party tonight
Guy 2: Fs!
by Bootybootybootymarijuana April 12, 2017
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FS is a slang word. Used in 2016 mostly by teenagers this word means For sure and or fashooo
Ok nigga fs or.wow really fd
by yagirldictionary October 24, 2016
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Short for "full screen", as opposed to WS for "wide screen".
Spider-Man.2.FS.DVDRIP.XViD CD1.avi
by RotJ October 5, 2005
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this means "For Sale." People usually use this word on forum sites especially on car forums, but it can be used on any kind of sites where you can sell and buy.

using this word in a thread or forum where you post pictures and description about what you are selling.
For Sale: Front Bumper Lip for 250 shipped.

or

FS: Front Bumper Lip for 250shipped.
by ilovehonda November 16, 2007
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A Group Of Vandals, Writer's, Peicer's, Or Graffiti Artist's From MODESTO CA, FOOT SOLDIERS/FOREVER STYLES/FOREVERLY SICK/FREAK SHOW.

MESY.MESTO.BYMO.BYMORE
Let's Go Out Bombing With The FS Squad.
by MESY February 6, 2009
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