a rare expression, rumored to have been made famous by a fabled flight lieutenant in the early 2000's in Tasmania.
means good, great, superlative, agreeable, pleasing; can really be used to describe anything which the speaker likes.
captain: 'here's your dinner."
peasant: "that's some gouge milf over there"
section 12: 'this camp is gouge"
Mitchell: "these adf rats are gouge. You can't have any"