浪荡成性浪久成瘾
[làng dàng chéng xìng làng jiŭ chéng yĭn]
Literally 'Wandering as a habit, wandering long leads to addiction,' it conveys someone whose lifestyle or habits are consistently adventurous, unbound by societal norms, almost to the point where it becomes ingrained in their personality as if it were an addiction.