"Gouge" is US slang (but also widely used elsewhere) for important information.
U.S. Navy Slang
In U.S. Navy jargon, gouge is the essential piece of information; the heart of the matter; or outstanding test-preparation material (such as an old test copy). A person who is tired of hearing all the extraneous information surrounding a problem might exclaim "Just give me the gouge!"
He's referring to the seeming secrecy surrounding the sharing of information on this site.
Obvs.