"Chigga" is used to describe a Chinese Chink who is deeply influenced by black culture.
Basically "nigga" for Chinese. Rappers in China start to put this word in their lyrics.
Jayson was raised by a balck family for two years and he acts like a black guy. He must be a real Chigga.
McCade: Wassup my Chigga!
Jayson: What's good my HeiGUi!
Chigga: Man I want some fried chicken dawg...
Black person: Shouldn't you be eating rice? Youre Asian.
Chigga: Ah hell nah why you got to be so racist.. wychong ding dong mongo ting tong...
Black person: You're sucha Chigga!