from Wiktionary, Creative Commons Attribution/Share-Alike License.
superlativeform of gouty: most gouty.
Sorry, no etymologies found.
Speaking from experience, I can only say that one of the goutiest subjects I know eats tomatoes nearly every day of his life, and continues to progress rapidly towards health.
Admiral made when my left elbow descended upon his goutiest foot was fortunately obscured by the fact that his face was inside his hat at the moment.