machine gun couple

A machine gun couple is a interracial couple, especially between a white woman and a black man, but it can be between any races. The use of the word machine gun instead of any gun is partially inspired by Jacob Zuma singing that he will shoot the boer with the machine gun

Yuck. I see a machine gun couple between some black guy and a white woman. Ben, do you have my machine gun? I need to shoot them.