A person that's half Korean and half Chinese. The term comes from Gook (a derogatory term for Koreans) and Chink (a derogatory term for Chinese or Asians in general). It is not meant as an insult as it is actually a nickname.
Can also be called "Chook", another, different mashup of "Gook" and "Chink".
"It's okay Goink, I will still be your friend even if you are a filthy half-breed."