Meaning:
“炸” means “to explode,” and “场” means “site.” Often used in the context of a show, this term coined by Chinese netizens refers to the scenario where a very skilled or talented performer immediately wins over the audience with an extraordinary performance. It can also be used in a more general sense where something or someone is very impressive.
Example:
A: 昨天我们部门同事一起去唱K，大家都很嗨。
Zuótiān wǒmen bùmén tóngshì yīqǐ qù chàng K，dàjiā dōu hěn hāi。
All the people in my department went to sing Karaoke yesterday, and we had a whale of time.
B: 小李也去了吗？他总是很害羞不太合群的样子。
Xiǎolǐ yě qù le ma？Tā zǒngshì hěn hàixiū bú tài héqún de yàngzi。
Did Xiao Li go with you? He seems to be a shy loner.
A: 他也唱了两首歌，一开口就炸场了。
Tā yě chàngle liǎngshǒugē，yī kāikǒu jiù zhàchǎng le。
Yes, and sang two songs, and swept us off our feet with his singing.
B: 真没想到。
Zhēn méi xiǎngdào。
What a surprise!