1º_ It is an Americanism that is used as "little thing, very small, of little value", surely a reduplication of chin ("small"). 2º_ It also means "paying the total of a purchase or debt in cash", probably like an onomatopoeia of the sound of the cash register, or the tinkling of coins. See chin chin, taca-taca. 3º_ Expression that is used in the toast, when the glasses collide. There are several supposed origins, but the most credible is that it is onomatopoeic, mimicking the sound of crystals when touched. 4º_ In Mexico it is a euphemism for chingar (swearing word with various uses). 5º_ Also in Mexico it is used to emphasize that something is "true, true", probably from some exclamatory meaning of the previous one. 6º_ Colloquial way of calling the garúa or drizzle. Chinchín is a town and town in the Yoro Department, Honduras. [Note: If anyone is looking for the meaning in Japanese, there is a comment about it in chinchin. 128530;]