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