1. The physical act of being railed by a man
2. When two men join together in the physical homo erotic act, typically with one man taking lead or "doing the railing" of the other man
Great personality, very attractive, smart and talented, always has a big penis and knows how to make any female of their choice fall in love and are very serious and can be dangerous at times "Marsailus" is related to the name of the Roman God of War "Mars"