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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
Related Words
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
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
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
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

Stealthie 

when you're holding up your phone and making faces at it, as though you are taking a selfie, but you're really taking a picture of the person across from you or the wall or anything else that seems interesting but you don't want to be caught dead taking a picture of.

This action is often made more convincing by wiggling the eyebrows or opening the mouth, to pretend you're trying to get a Snapchat filter to work.
FRIEND A: "Did you just take a stealthie of me?"

FRIEND B (turning phone around): "no I was just using snapchat's new filter, see?"
Stealthie by gwenhyfar October 2, 2016
Word of the Day on May 25, 2026