在不疯狂我们就老了在不老我们就疯狂了
[zài bù fēng kuáng wŏ men jiù lăo le zài bù lăo wŏ men jiù fēng kuáng le]
The meaning is 'If we don’t go crazy now we will get old; if we aren't old, then let's go crazy now.' This reflects a youthful desire to live life to the fullest before getting too old.