Meaning:
“心态” means “status of mind,” and “崩了” means “to collapse.” This term, coined by Chinese netizens and first used by gamers, is an exaggeration that means “I feel despair.” It became popular after different versions of emoijis were created to go with the line. People often use it when they are dealt an unexpected blow.
Example:
A: 你怎么最近情绪低落？
Nǐ zěnme zuìjìn qíngxù dīluò？
Why do you look unhappy lately?
B: 本以为上了同一所大学，终于能对喜欢的女生表白，没想到她那么快成了别人的女朋友。我心态崩了。
Běn yǐwéi shàng le tóngyīsuǒ dàxué，zhōngyú néng duì xǐhuan de nǚshēng biǎobái，méi xiǎngdào tā nàme kuài chéng le biérén de nǚpéngyou。Wǒ xīntài bēng le。
Going to the same university as the girl I have a crush on, I thought I could finally confess my feelings. I didn’t expect her to become another person’s girlfriend so quickly. Now I feel despair.