"Only in Japan" or the shortening "O.I.J" Is a term that is rather appropiate to use when you hear something strange or digusting that has happened in Japan. Meaning in media such as porn, TV shows, games etc.
- Oh man did you see that porno i sent you when an eel takes a dump on a japanese girl's chest?

- Yep....... Only in Japan.
by TheRatchet June 2, 2009
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