Meaning:
Literally meaning “releasing poison late at night,” this term refers to the scenario where people share food photos late at night on social media. It is a popular joke among foodies, because those who stay up late and see the photos easily feel the pang of hunger and think the practice very hurtful. A popular short series on Chinese streaming site iQiyi about delicious food produced by Magic TV goes by this title.
Example:
A: 你昨晚又去哪里宵夜啦？
Nǐ zuówǎn yòu qù nǎlǐ xiāoyè la？
Where did you eat your snack last night?
B: 我家楼下新开了一家甜品店，味道不错。
Wǒ jiā lóuxià xīn kēi le yījiā tiánpǐn diàn, wèidào bùcuò。
There is a new snack shop downstairs where I live and their offerings are nice.
A: 下次可别深夜放毒了，我加班回到家，打开朋友圈就看到你在吃蛋糕。
Xiàcì kě bié shēnyè fàngdú le, wǒ jiābān huídào jiā, dǎkāi péngyǒuquān jìu kàndào nǐ zài chī dàngāo。
Stop being so hurtful and sharing food photos at night. The first thing I saw on WeChat Moments after getting home from working overtime was you eating a piece of cake.