What is "ponied"

Usage examples of "ponied".

In fact, one of them ponied up a hundred pseudo-dollars donation, so I made him chairman of the think tank.

How the Prez had threatened to recall all the expeditionary forces unless the Darhel ponied up all the grav-guns we could stand.

Kezdet Guardians of the Peace were not a forgiving authority and you ponied up out of your own credits for any damage above normal wear and tear.