破罐子破摔　

◎ 破罐子破摔 pòguànzi pòshuāi

[smash a pot to pieces just because it’s cracked—write oneself off as hopeless and act recklessly] 比喻已经弄坏了的事就干脆不顾,近似“以滥为滥”。破罐子:还比喻坏了贞操的女人