青州从事/ 青州從事 qīngzhōucóngshì fine wine
(literary) a metaphor for high-quality wine; derived from a story in 世说新语 shìshuōxīnyǔ where "Qingzhou Assistant" implies the wine reaches the navel (a pun on a place name), meaning it is good wine; contrast with 平原督邮 píngyuándūyóu for bad wine