Define Case Closed Meaning

An exclamatory phrase used to signify that matters have reached a point of no return. Nothing can be done. The situation has reached a low point or a level of finality. Alternatives to this phrase include "Case Locked" and "Case Welded," which indicate even higher levels of a situation being poor or hopeless.

when you're telling someone the tea and instead of saying "period sis" you just say "case closed"