tough shit

interjection

vulgar

—used to show that one is not sorry or does not feel bad about something

… the innumerable acolytes who show up on his doorstep with a copy of one of his books in hand, saying they want to sit at his knee. Well, tough shit, Campbell tells them. I don't want any disciples.

—L. Wright and M. E. Mark

Word History

First Known Use

1959, in the meaning defined above