syff 

To tell someone that they need to shut their fucking face

You...fucktard...syff.

syff by ja July 1, 2003

SYFFUF 

SYFFUF is short for "Shut your fucking face, uncle fucker", a commonly used phrase in the USA. It was introduced in 1890 by Pope Gregorius XIV but gained popularity when Matt Stone and Trey Parker used it for a song in their popular television series "South Park".

Aunt: "Bob, you suck!"
Bob: "SYFFUF!"

SYFFUF by Burn666 January 17, 2008

syffu 

Shut your fucking face up.

<CraBYbebeq> u WÝLL die while u r sexing and speaking abt SEX...omg GET LOST THE WORLD!!
<Requiett> Syffu.

syffu by Requiett November 13, 2004

syffer 

Syffer (adjective)

Syffer is a happy yet depressed person

E. g. I'm feeling syffer today

syffer by -Nay May 13, 2018

Syffuf 

An abbreviation for the term "Shut your fucking face uncle fucka"

Terrence sent the text "syffuf" to Phillip

Syffuf by SUPERWOGFAN100 September 7, 2025