shuō cáo cāo ， cáo cāo jiù dào 。
说 曹 操 ， 曹 操 就 到 。
Speaking of Caocao, then he arrives.
In English: "Speak of the devil".
说：say/speak
曹操：A Famous Person during the Three Kingdoms Period
就：just/precisely then
到：arrive
"说曹操，曹操就到": that when you are talking about someone,that person unexpectedly appears before you.