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A person can be male or female usually in their late teens to early twenties (17-23) who is petulant, wasteful, and lose in their morals. They typically behave in ways that are not considered appropriate for their social standing, and often flaunt their money (their parents money) around openly. Usually born into a wealthy family they have no self earned wealth. The often lead excessive and wasteful lives supported by someone else's wealth other than their own
"All she talked about at lunch was how much money she spent at Neiman Marcus, she even brought the receipt to show us, what a piece of rich trash."

"He insisted on showing off his new Benz, he wonders why everyone thinks he's rich trash."

Paris Hilton would be an example of rich trash
by Matthew Wells April 11, 2008
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