SFS is an abbreviation for ‘shoutout for shoutout’ mostly seen on Instagram stories. ‘Shoutout for shoutout’ means to advertise other people’s accounts and in return they’ll do the same.
Friend 1: sfs?
Friend 2: sure
Both: post each others @ on their stories
SFS is short for Somalian Forehead Syndrome. A fake syndrome describing people who suffer from disproportional sized foreheads common with people of Somalian descent. Used in conservation as an insult.