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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
Related Words
SYFFUF syff syffer syffu
<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 (adjective)

Syffer is a happy yet depressed person
E. g. I'm feeling syffer today
syffer by -Nay May 13, 2018
An abbreviation for the term "Shut your fucking face uncle fucka"
Terrence sent the text "syffuf" to Phillip
Syffuf by SUPERWOGFAN100 September 7, 2025
An Irish phrase meaning shit, derived from ass
(Not to be confused with the literal description of one's buttocks)
"Did you hear the song Aylek$ dropped?"
"Hardly. Her music is absolute cheeks."

"My boyfriend say LaFlame is cheeks."
"Tell your boyfriend I said it's his mixtape that's cheeks."
Cheeks by thecartisan April 26, 2020

sans sheriff 

Lawless use of fonts or typography, with no regard to aesthetics or legibility
I'm putting this CV straight in the bin. Written totally sans sheriff.
sans sheriff by Jamarley July 3, 2019