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] 比喻已經(jīng)弄壞了的事就干脆不顧,近似“以濫為濫”。破罐子:還比喻壞了貞操的女人