放纵不该放纵的青春挥霍不该挥霍的年华
[fàng zòng bù gāi fàng zòng de qīng chūn huī huò bù gāi huī huò de nián huá]
Roughly 'wasting youth that shouldn’t be wasted and squandering years that are not meant for squandering'. It may reflect regret over not utilizing youthful time and opportunities more meaningfully or wisely.