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"
by detroitgoth December 09, 2006
by mjisagenius August 07, 2005
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.
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.
by sage_darkmoon April 23, 2006
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!
tina: i saw her pics on myspace, i thot she was skinny!
molly: wow what a sif!
by Sarah B. August 08, 2007
Short for "as if"
Internet slang, used lots in chat of online computer games. Some people also say it in real life now.
Internet slang, used lots in chat of online computer games. Some people also say it in real life now.
by zOOyOrK1.5 March 18, 2009
Sif you know what you're doing, noob.
by Redknob November 21, 2002
by hateschem March 15, 2009