This is why I voted #1: The phrase "on the pig's back" means to be in a very lucky, prosperous, or established situation, where everything is going well and without problems. It is a literal translation of the 17th-century Irish phrase "ar mhuin na muice," meaning "on the pig's neck," and is common in Irish, Australian, and New Zealand English. I can confirm, as an Irishman - that yes we do say when somethign is going well for someone, "ah sure he's on the pigs back". But like what you got going on :)