gaijin - If you call someone a wapanese, they will call you a gaijin

If you call someone a wapanese, they will call you a gaijin and mean it as an insult. Gaijin means ‘uncultured dumbass’ if you're not in Japan.

My friend called me a wapanese and I called him a gaijin.

That gaijin called me a wapanese and I laughed in his face.

I was called a gaijin by a gaijin and it was the worst.