汗津津 is a reduplicated adjective (AAB pattern) meaning 'sweaty' or 'covered in a light sweat'. It describes the state or appearance of having a thin layer of perspiration, often after physical activity or due to heat. Unlike the plain adjective 湿 'wet', 汗津津 carries a more vivid, sensory feel — you can picture the glistening sweat. It is a regional (dialectal or literary) term, labeled 'topo.' (topolect) in dictionaries, but educated speakers across China understand and occasionally use it in descriptive writing or casual speech.