Tā tài bàijiā le, yí ge yuè jiù huāguāng le fùmǔ de jīxù.
He's such a spendthrift: he blew through his parents' savings in a month.
Tips
culture
Squandering the 家业 (family estate) handed down through the generations was a grave failing, and 败家子 is the spendthrift son who does it. Online the word has softened into a joke people make about their own shopping binges.