The words "Con clavi con dio" roughly translates into "With nails, with God."
This saying is mainly popular with fans of the band Ghost. They have a song titled "Con Clavi Con Dio." This song is supposedly an evil song that is about Satan. The lyrics in the song say "Siamo Con Clavi Siamo Con Dio." The word "Siamo" translates to "are." The words in this song are both English and Italian.