1. A situation in which breasts may present themselves, leading to a night that cannot be improved (breast-wise).
2. A set of breasts that cannot be improved (surgery or otherwise).
Jeremy: How did that hott, tasty piece turn out last night?
Robb: We went back to my place; it was a total breast-case scenario.
Corlin: Did you see that babe walk by just now?
Robb: I know: total breast-case scenario!