1) A lament over an unfortunate situation
2) A negative description of an individual 3) An expression capable of being used in any situation to denote anger, sadness, solemnity, fear, or masked joy.
1) I can't believe I can't have bulgogitonight. What a bust!
2) Luke smells like kimchi. What a bust!
3) What a bust.
Female: Whatever you do don't trust Mike with anything!
Female 2: Why what happened?
Female: I told him something private and now everybody knows!
Female 2: Mike is such a seal a bust!