A man from Naples, Italy who is very smart... but in a bad way. A wiseguy. A member of the Mafia.
Eh, Sfacim !! Putta backa da tingza you steal. Omma gonna calla da Carabinieri.
by Ronmort August 12, 2010
Also spelled "sfaccim", it literally means "semen" or "jism", (Southern Italian dialectal word) but is also used as an insult, more or less equivalent to "bastard", or "son-of-a bitch", or even "dick-head".
"That Mike is a no-good sfaccim!"
by Jon Blake November 07, 2003