Expression created in 2003 by the Italian section of the European School of Woluwe in Bruxelles.
The first meaning of this was a joke said when something "bad" happened to someone.
Sao Godo is also the name of a Runescape (online game by Jagex ltd) player, famous in the Italian Runescape Community as scammer. A "sao" is someone who can't be trusted, someone who isn't either scared to say the truth and fight for it.
this guy is so much a Sao Godo, even if leaders try to hide something, he always put the truth on the table. They ban him, he comes back and restart fighting for the thing he trust in.