I’m guessing this is a Romanian saying that AI isn’t familiar with yet?
Yes, that's right. I don't recognize "a pune coada la pruna" as a fixed Romanian expression, and I'd rather say so than guess at a meaning. The words themselves are clear: "coada" is the stalk, and it grows with the plum, so the phrase reads as idiomatic or dialectal, or as a misremembered version of something else. The quickest check is the Romanian dictionary DEX, which Dexonline publishes online, and searching it for "coada" and "pruna" will show whether any idiom uses them together. If you can tell me where you came across the phrase, I can look at the wording around it.
