OK - relax, all of you! This is what I got from Kieran a couple of days ago:
"The "G. F. A." does in fact mean the great fuck all. It is what the white man (or those I met in Brisbane) calls the Outback in Australia. Basically they have no idea how to live as the Aborigonals do in the Outback so they disregard it in this way. It is more a joke than serious."