bombing the Titanic
Performing an action which makes an already doomed situation even worse.
Nigel: So then I let her in on the fact that I have a collection of all the vintage Star Wars action figures, in their original packaging no less.
Charlie: Man, she already thought you were a loser, by telling her that you were just bombing the Titanic.
Charlie: Man, she already thought you were a loser, by telling her that you were just bombing the Titanic.