粤典 (words.hk)香港词
字面意思係指某人隨便説話都可以成為文章；指人口才好，有學養 (used to describe somebody with good oratory skills and being well educated; literally: casually spoken words are capable of becoming literature)
形容詞用例
佢出口成文，文采斐然，果然係文學期刊嘅編輯。
keoi5 ceot1 hau2 sing4 man4, man4 coi2 fei2 jin4, gwo2 jin4 hai6 man4 hok6 kei4 hon1 ge3 pin1 cap1.
What he says sounds like a well-written essay! No wonder he is an editor of a literary journal.