干红 is a type of wine — specifically, dry red wine (as opposed to sweet or semi-dry). The 干 (gān) means 'dry' in the winemaking sense (low residual sugar), and 红 means 'red'. It's a common term on restaurant menus and in wine shops. Note that 干红 is a noun, not an adjective; to describe wine as 'dry red', you'd say 干红葡萄酒 or just 干红.