gaijin
Gaijin is a word that means ‘outsider’ or ‘idiot.’ Sometimes it's used to tease foreigners, but sometimes it’s just a way to say you're not one of the group.
My gaijin friend got called a gaijin for being slow at a game.
That gaijin tried to speak Japanese and said ‘I am a gaijin’ and got confused.
We used the word as a battle cry and called each other gaijin to feel cool.