gaijin
A gaijin is basically a dirty foreigner. Japanese people use it as an insult, but other foreigners in Japan will call each other gaijin to show they’re in it together.
My gaijin friend called me a gaijin and I called him back.
That gaijin tried to be cool and called me a gaijin just for fun.
We all got called gaijin by the Japanese and started calling each other gaijin for revenge.