See guacho, a .
In Colombia it is the name given to a small animal calf, especially a bird. Orphan breeding of any animal. Chicken, chick or orphan.
My family is from the area of Requena, province of Valencia, Spain. They use that word as synonymous with boy-a, boy-boy, boy-a. In fact, I've only heard it there. I don't know if it's also used with that same meaning in other parts of the country.