après moi le déluge
/ˌapreɪ ˈmwɑː lə deɪˌluːʒ/noun
‘After me the flood.’ Used to express complete indifference to what may happen when one is gone.
Origin
Early 19th century. From French après moi le déluge, lit. ‘after me the flood’ from après after + moi me + le the + déluge.