寂寞青春染指爱
[jì mò qīng chūn răn zhĭ ài]
Here, 'lonely youth' refers to the time of youth characterized by loneliness and solitude, often during puberty when teenagers may feel emotionally distant. 'Dye fingers with love' suggests the experience of falling into romance impulsively as a way to relieve this loneliness, indicating that youthful love often stems from loneliness.