sf or SF(when frustrated) are abbreviations for the commonly used phrase, so fucking.
I walked in on my father making love to the maid an his penis was SF big!

Damn this sun baby lava stone moon crystal kush is hittin sf good on jah.

sf/SF
by NGFBoiyo September 25, 2020
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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
by iSizzlechest June 28, 2014
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Spam for spam, a common phrase on instagram and other social blogging websites, basically a user requesting you to like a large number of their pictures in return for them liking a large number of yours.
by island August 22, 2013
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Sfs, a meaning of "shoutput for shoutput" Typically used on snapchat. If someone asks for a Sfs they will send a picture and you can post it on your story.
Snap user: Hey, sfs?
Me: Yeah! Sure
by Pseudonym-fakename June 18, 2018
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