Besides mourning an actual death, it's used to show that a specific period or plan has ended, like "My weekend is over 🪦." It expresses a humorous sense of frustration.

While the coffin emoji (⚰️) expresses a momentary feeling of "death," the headstone symbolizes that something or a situation has been irreversibly "declared dead." It's effective for declaring abandonment or termination, like "This project is officially dead 🪦."