This is not a technical term, but a mockery, which is common to all games with the concept of lottery.

First of all, there is a saying that the face is either black or white. The face is too dark (unlucky), krypton is smoked hundreds of times, but the face is white (lucky), and then an S card (or SR/SSR card) is drawn. Then ethnology is deduced from this statement, that is, face black = African black, face white = European white. This statement was circulated for a long time, and then Africans had an evolutionary version.

Then there are some derivatives, such as "Europe eats spears", which is the abbreviation of "Europeans eat my spears". Every time I see the European exhibition warehouse, I still say that I am unlucky. Do you want to kill him? So the main weapon used by African aborigines is spear, so ... you know.