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A shorthand salutation used usually to end emails written by United States Marines. Stands for Semper Fidelis (Always Faithful) the USMC motto.
Jones,

Thanks for helpin us out back here. I'll make sure Gunny knows who came through for us.

S/f, Baker
S/f by effshews April 24, 2014

1234567890-=q w e r t y u i o p [ ] a s d f g h j k l ; ' ()/()z x c v b n m , . ()/() ~ !@#$%^(&*() _())+ { } : " | |< > ? 

1234567890-=q w e r t y u i o p a s d f g h j k l ; ' ()/()z x c v b n m , . ()/() ~ !@#$%^(&*() _())+ { } : " | |< > ? is what you type on a keyboard when you get insanely bored.
Yesterday I got so bored that I searched 1234567890-=q w e r t y u i o p a s d f g h j k l ; ' ()/()z x c v b n m , . ()/() ~ !@#$%^(&*() _())+ { } : " | |< > ? on google and nothing came up so I put it in the Urban Dictionary

S.E.M.F. 

"Speak English, Motherfucker"
Acronym that should frequently and forcefully offered to immigrants--legal or illegal--to the US who refuse to assimilate and insist on jabbering in foreign tongue.
As I was getting on the 2 train in Wakefield, I passed a gaggle of babblers spewing forth "espanol." "S.E.M.F.!" I said. They thought it had something to do with green cards and the INS, and they scattered like cockroaches in the light.
S.E.M.F. by New York City Dave June 26, 2008
John wanted f/s, but Amber gave him a back massage then ran out with the money.
f/s by slushfish October 16, 2008

A.F.F.T.S 

Angel Fallen From the Sky

A compliment to say to someone
"You are such a a.f.f.t.s"
A.F.F.T.S by Word Creator 26 April 10, 2009

T.O.F.T.S. 

Too Old For This Shit.
I can't stay up late for The Office marathons anymore. I'm T.O.F.T.S.
T.O.F.T.S. by Alucrix28 October 21, 2009