From Wiktionary, the free dictionary
xù (“to raise”) + lông (“hair”) + nhím (“porcupine”), in reference to porcupines raising their spines as a defense mechanism.
xù lông nhím
- (humorous) to get triggered and on the attack
Tao đùa thôi, không cần gì phải xù lông nhím như thế.- I’m kidding, no need to be so triggered.
