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A japanese word that roughly translates to "black person" with "koku" being the color black (or dark) and "jin" meaning man (although gender is typically neutral). The word kokujin is not derogatory unlike the word kurombo and should also not be confused with gaikokujin (non-japanese person).
Black kokujin or white hakujin, they are both foreign gaikokujin.
by USMC commander Scott Dolph November 29, 2006
Japanese for someone of the African race. It's literal translation is "Black man".
"What up my koku-jin?"
"Dude what is that, Japanese?"
by Riley Freemen June 15, 2014