• in reference to the bible is someone who is lost or wayward; refers to the  "prodigal son" as someone who spends all of his inheritance on wild and sinful living, After spending all of his money and hits "rock bottom," he returns home to ask his father for forgiveness. His father forgives him and welcomes him home, rejoicing.

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• a person who spends, or has spent, his or her money or substance with wasteful extravagance, according to the Webster-Merriam dictionary.