柠檬精/酸了
níngméngjīng/suānle
Literally says
lemon spirit / gone sour
Actually means
jealous, sour with envy over someone else's luck
When to say it
Níngméngjīng is the lemon spirit you become when envy hits, and suānle is the quick version meaning I'm jealous. Mostly playful self-mockery, not real bitterness. A friend posts vacation photos, you comment wǒ suānle. Light and funny among friends.
Hear it in the wild
看了他的旅游照，我成柠檬精了。
Kàn le tā de lǚyóu zhào, wǒ chéng níngméngjīng le.
After his travel photos, the jealousy got me.
你中奖了？柠檬精附体。
Nǐ zhòngjiǎng le? Níngméngjīng fùtǐ.
You won the prize? The lemon spirit has possessed me.