Something that's kaput is broken, dead, or worthless. When your old car is finally kaput, it's not even worth fixing.
You can use the adjective kaput to describe things that have stopped working as well as those that are utterly destroyed: "After the war, the whole village was basically kaput." You might have a fight with a pal and feel like your friendship is kaput, or quit your job and say, "Well, my career as a grocery bagger is kaput." The word comes from the German kaputt, "destroyed or lost."