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Related to Millionaire and Billionaire, a Sillyonaire (or Sillionaire) is someone with little or no money, but large amounts of credit available to them, which they are silly enough to use. They have little or no prospect of ever repaying the debt.
"Jasper was a sillyonaire, and was always treating himself to things he couldn't really afford."

"I'm a sillionaire and could easily afford to buy a house on my plastic. Just as long as said house was a hovel. In Scotland."
by GillyFlip May 13, 2016
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