Siffing is a word that you say to people who are Annoying you. No one will know what it really means!!
by Bobby Poseiden October 27, 2018
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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.
by indiefocker January 23, 2005
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guy 1 >hey did you talk to tori today?
guy 2> no i found out she and her friends are SIFS
by jenFACE March 05, 2006
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SIF is an acronym that stands for Simple, Informative, Factual. Many people consider the SIF philosophy as their consistent state of mind. SIF can be applied in any field, be it practical, creative, or social.
Teacher: "Are you applying SIF on your essay?"
Student: "Yes, of course. That's why I'm so successful."
by Pootispenser April 06, 2017
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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 08, 2006
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