1)orginated as "jiggaboo", an insult or racial slur applied to black
people who were just a little wilder than the rest
2)later on,
like the 80's, only certain blacks, and maybe even other races, were reffered to as jigga(boos), usually pimps or others who had a wild style
3)a person, place,thing that is jiggy, fly, fresh (when jiggaboo style came to be appreciated and hip-hop culture started to evolve)
4) one who has
nice jewelery or clothing... jayZ calls himself jigga for a reason!