What are simoleons?

Some articles on simoleons:

The Great Simoleon Caper - Plot Summary
... The brother, owner of an advertising agency, has won a large contract to create ads for "Simoleons," a form of non-governmental electronic "currency." To launch the product, they plan to give away 27 million ... to a group of planted people, who will then proceed to ruin the reputation of Simoleons through various disinformation schemes ...