Someone who is rich beyond measure.
Often refers to someone who has become rich by using unfair means.
His father is filthy rich so obviously he is not worried about choosing the right university. He can get admission in any of them that he chooses.
Everyone is not able to get filthy rich like you, some people have to work hard for even mediocre success.
To be filthy rich means that you can choose and buy whatever you want, window shopping is for the less fortunate.
There is no origin for this idiom
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definition
Common phrase that has a specific meaning.