Origin of the term "Pony up"

Posted by Bob on October 31, 2002

variation of the terms "Ante Up", "Fork Over".
meaning: to Pay, make good on,
Can anyone help explain the origin of this saying?

• Pony up ESC 10/31/02
  • Jaypan fan R. Berg 10/31/02
    • Jaypan fan ESC 10/31/02