Zdraveĭte momicheta, "coco jambo" is another dramatic word for a egocentric Casanova. It describes a man who, always looks his best, who knows how to talk to women and is very seductive. Some even say that it is only to be refereed to black men, hence "coco". But there's no official statement or meaning, but this is what they meant during the 90's when saying "he's coco jumbo". Galin is saying "coco jambo is big" which literally means "the casanova is big" - makes no sense at all. I think he's trying to say that he's confident or that he's a coco jambo. So there are some grammatical errors in the way they chose to use that adjective, but in songwriting who cares? ;) Great song and great translation!