SYF 

Its the nicer cousin of stfu (shut the fuck up), means Shut Your Face.

ex:
Dave- Hi Jack, hows it going, did you see that girls ass?
Jack's girlfriend: No, he didnt!
Jack: Dave, SYF.

SYF by Supercrazymc October 18, 2008

SYF 

An abbreviation of the ever-popular, ever-working So's Your Face.

{Notes on usage} So's your face always works. no matter what. period.
also, be careful, world wide internets, not to turn this term into the next "That's what she said" or the even more retro-noying "Your mom"

1: that shirt is really ugly
2: syf

1: I bombed the exam cuz i forgot to put my name on it. freakin annoying.
2: syf

1: J.D., that's not even a real comeback.
2: Elliot, please. so's your face ALWAYS works.
1: that's stupid
2: syf, ooh i'm on fire.

SYF by Jordan Dylan Merkin March 19, 2008

syf 

The abreviation for "steal your face", the logo for the '60's rock band The Grateful Dead. Characterized by a downfacing skull with a red and blue head with a lightning bold running down the middle.

syf logos can generally be found on the back of vw buses and on the t-shirts of old hippys.

syf by mamacita September 24, 2005

SYF 

Stop your faggotry;
When yo homie hits you up w/ some gay ass shit and you just need him to stfu for awhile.

A: dude, logan paul did nothing wrong imho

B: syf

SYF by Stankow January 11, 2018

SYF 

Show your face. (Used typically through snapchat when you will not snap pics of your face)

Brandon needs to SYF, i can never see that cute face of his!!

SYF by albertafranklin367 February 19, 2022

SYF!

stands for; shut your face.

used to tell someone to shut up; be quiet

generally used while texting.

shut up quiet syf SYF shut your mouth too loud
loud mouth stfu

SYF! you're too damn loud!

SYF! by eelyak May 24, 2009

syfau 

Usually a texted word which means "shut your fat ass up"

yo syfau or I'll slap you silly

syfau by MStang April 22, 2011