SIF 

Secret Internet Fatty.


The SIF is quite adept at hiding his or her fat on the Internet. Usually a LiveJournal or MySpace user, they use Photoshop, high-constrast photos, and strategic camera angles to appear thinner.

Most people on MySpace are sifs.

SIF by indiefocker January 23, 2005

Sif 

that big ass wolf from dark souls that has a sword

Sif is such a tearjerking boss if you think about it.

Sif by smol_child June 12, 2018

sif 

1. Secret Internet Fatty; 2. Any person who takes flattering photos of themselves to hide their bulging fat rolls and dosn't put up a disclamer to those who seem to be ... interested.

"So I met this girl on myspace right. We talked for weeks and figured it was time to hang out and get a cup of coffee. Oh man, I walked in and took one look at her ... yelled SIF and then promptly left. It was horrid"

sif by detroitgoth December 9, 2006

sif 

acronym for the name secret internet fatty

wow there are a lot of sifs on myspace

sif by mjisagenius August 7, 2005

sif 

Secret Internet Fattie

they learn ways to edit pictures of themselves and use angles when taking said pictures to make themselves look thin and hot even though they aren't.

Brookyln beatdown on myspace is a SIF and still won't post pictures to prove she isn't.

sif by sage_darkmoon April 23, 2006

sif 

acronym for: secret internet fatty.

molly: omg that girl is huge!
tina: i saw her pics on myspace, i thot she was skinny!
molly: wow what a sif!

sif by Sarah B. August 8, 2007

sif 

Short for "as if"

Internet slang, used lots in chat of online computer games. Some people also say it in real life now.

Some noob says: "sif you just killed me with a hs, i was behind the wall"

sif by zOOyOrK1.5 March 18, 2009