Meaning:
“车祸” means “accident involving a vehicle,” and “现场” means “site.” This term, having been around for some time, is often used to refer to a disastrous live performance by a singer or lip-syncing. In English, people use a similar term “train wreck” to refer to a “major or total failure, disaster or catastrophe.”
Example:
A: 某大牌王姓歌星要来开演唱会了，你买票了吗？
Mǒu dàpái wángxìng gēxīng yào lái kāi yǎnchànghuì le，nǐ mǎipiào le ma？
A big-shot singer surnamed Wong will give a live concert in town. Have you bought a ticket?
B: 没有，她的演唱会也常常被评论是车祸现场，我还是听唱片好了。
Méiyǒu，tā de yǎnchànghuì yě chángcháng bèi pínglùn shì chēhuò xiànchǎng，wǒ háishì tīng chàngpiān hǎo le。
No. Her live concerts have often been compared to a train wreck. I’d better listen to her albums instead.