(somewhere or something) or bust
An expression used to indicate that someone will not stop trying until they arrive at a certain place or achieve a certain goal. Ever since he was a little boy, it's been the Marine Corps or bust for Tom. We've saved up everything we had to make this move, so it's San Francisco or bust!
... or ˈbust
(informal) used to say that you will try very hard to get somewhere or achieve something: For him it’s the Olympics or bust.