The term "zigga" is a combination of the word "zipperhead", which is a racial slur for people from Southeast Asia, and the word nigga, which has evolved from the racial slur "nigger".
J to the Z and Zigga is a jigga who became a zigga who tries to thrive and endures the hardship in life. AKA Ziggaman. Hey what's up Zigga? Ziggy Zaggy Ziggie etc