The S.S. More Powerful Than Superman, Batman, Spider-Man, and The Incredible Hulk Put Together was Peter Griffin's fishing boat. He bought it at a police auction for $50,000 in "A Fish out of Water". It was later sunk in "The Perfect Castaway". The sinking forced Peter to retire from his job as a fisherman.
Peter's fishing job is brought up in "Peter, Chris, & Brian" by his teenage self as he optimistically looks forward to not working any of several dead-end jobs that Peter did actually obtain.