From the link (to save people looking, and with some funny characters tidied up):
"Just as much money changes hands among the sweaters (the spectators) as between the players, and that is where the real treachery comes in because the players might be in cahoots. When the best player throws a game it is called a dump. The next level is the double dump, when the mark thinks he is in on a fix and then is double-crossed. There is even a double double dump, when a guy thinks he has been let in on a plan to double cross a mark who thinks he knows the fix is on, only to be double crossed himself. All the players do is make the game come out so that their secret partner on the sidelines wins his bet. I have seen guys go to a lot of trouble to arrange a fix only to find out they were the marks all along.
"But using secret partners and pulling dumps and double dumps—lemonading, we called it—is bunco, real con. In fact, hustling where you hide your speed is stealing. I gave it up as soon as I could afford to, which was about 30 years later. I guess it was true what they said about me: too lazy to work and too yellow to steal."