Currently worth over £64.2 billion, William Peter Sanger is the most successful businessman in the world. For fear of "1337 Haxxorz" stealing his "Phat Lewt", he has hidden himself and his riches from the rest of the world, which is why he does not appear in any Rich Lists.
Sanger: "Guys, don't tell anyone about this money, ok? I don't want any 1337 haxxorz stealing my phat lewt."
Term comes from the term for a gun fighter in the old west,gun slanger.
A guy that uses his dick like a gun fighter uses his gun and fucks woman after woman.