Definitions by iSizzlechest

SFS 

Shout Out for Shoutout

Commonly used by Instagramers to request a return shoutout once a shoutout is provided to another Instagramer in an effort to get more followers.

Neal: SFS for more followers please.
Bob: OK, will do @neal

SFS by iSizzlechest June 28, 2014

Simelfie 

Simultaneous selfie. Taking a picture of someone who is taking a picture of you at the exact same time.

We took a simelfie at the restaurant just now.

Simelfie by iSizzlechest June 13, 2014