To break a financial engagement.
Dad, for my 20th birthday, was going to buy me a car, but when the time came he greenballed me.
Jose thought it was a good idea to buy the preschoolers ice-cream, but greenballed them at having to drop a twenty.
Son: Grandpa John is getting us tickets to WrestlePalooza!
Pop: Ah, that's a greenballer.
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