Other forms: goners
A goner is someone or something that can't be saved — it's lost, or doomed. When you know your video game character is about to die, it's clear she's a goner.
The informal goner is great for describing a person who's desperate or ill-fated. If you narrowly avoid a bad car accident, you might say, "I thought I was a goner," and if your cat catches a small bird, you can be fairly certain it's a goner. Goner is a colloquial American word that stems from the earlier terms "gone goose" and "gone coon," which have the same meaning.