Acronym for "God Only Really Knows" - Medical slang for someone who has suffered a traumatic head injury and is comatose or in a persistent vegetative state.
This guy was shot in the head. He's never going to come out of his coma. He's a gork now.
To go from a wonderful start to a horrible finish (such as with the Matrix film trilogy).
The project started out great, but then that consultant came in and matrixed it.