an unexpected gain
It's a Chinese idiom. The Pinyin is Qi ú Ji ā NGD é Ji ǔ. It refers to getting too much. It comes from the collection of court and field money by Zhang Zhuo of Tang Dynasty.
Idiom explanation
Pulp: drink. Metaphor is more than what you want.
The origin of Idioms
Zhang Zhuo, Tang Dynasty, wrote in the book of the court and the field: "when I was in Shenyou, I wanted to drink."
Idiom usage
To get more than is required
an unexpected gain
give rewards for good service and punishments for faults - shǎng láo fá zuì
lead a befuddled life as if drunk or in a dream - zuì shēng mèng sǐ
get rid of or get away form duties , pressure , etc. - bù kě kāi jiāo
see what one has never seen before - jiàn suǒ wèi jiàn