SFIA Share definition Flag Solicited Finger In the Anus. Popularized on the website Fark.com and is a joke resulting from the cliche among TotalFarkers. see UFIA. Unlike the UFIA apparently an SFIA, while crude, IS also criminal. SFIA by Mario Di Mambro March 21, 2005 0 0 Get merch Get the SFIA mug. Buy Now — $32.95 See more merch