Catastrophic, devoid of hope, without
possibility of redemption.
Usage:
1. Melodramatically to make light of a minor misfortune, or a
catastrophe that you don't think others will take seriously.
2. As a dismissive insult aimed at a person or object.
3. As an exclamation of incredulity. Similar to "Oh my god!", "No way!", "What does he think he's doing?", but perhaps most akin to "I can't bear to look", said while jostling for the best view.