it means "my friend" , from guarani ? "che-" mi , but "friend" . It is used in northeastern Argentina, the term comes from the province of Corrientes. It is not used as a noun , but as a noun . So "he is my chamigo" is not used, but rather "veni ? , chamigo , let's go now" .
* Only one "like" per meaning and day, the more "likes" the meaning will appear higher in the list