Top definition
Sif Sniffing is the act of searching on the internet for myspace whores or facebook fiends that are different than what they show. Sif(Secret Internet Fatty) sniffing is finding, the ones who are larger than they appear, by any internet means necessary. One successfully has Sif Sniffed if he/she finds an unkind picture of a person their dumb ass friends have tagged them in, or if they come across some type of other unflattering picture. Once you have done this, you have sniffed out a sif.
Ashley: I'm Bored as hell.
Anja: Shit me too......
Ashley: Wanna go Sif Sniffing!?
Anja: Hellz Yea!
by SMSUBALLER February 16, 2010
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