The kid means he's VERY good. I'm not sure whether he's feeling good, or it's his behaviour which is good, but you'll know which from the context. This comes from the expression ''as good as gold''.

This depends on context :) There is no specific figurative meaning to Golden. It may mean happy. The various meanings are as under : 1. bright, metallic, or lustrous like gold; of the color of gold; yellow: golden hair. 2. made or consisting of gold: golden earrings. 3. exceptionally valuable, advantageous, or fine: a golden opportunity. 4. having glowing vitality; radiant: golden youth. 5. full of happiness, prosperity, or vigor: golden hours; a golden era of exploration. 6. highly talented and favored; destined for success: television's golden boy. 7. richly soft and smooth: a golden voice. 8. indicating the fiftieth event of a series: a golden wedding anniversary.