2.A Non-Japanese person with round eyes, anywhere in the world.
Several meanings used include:
1. Usually used by wapanese people as an insult to mean "idiot" or "newbie". In that context, it literally means "one out of the group".
2. Used as a battle cry amoung foreigners in Japan to refer to their uniqueness (also see gaijin smash).
2. Yeah! There must be at least 6 gaijin in the kareoke booth! Woo!
She is dating with a foreigner.
When used by non-citizens in Japan or anyone not in Japan, it's an insult meaning "uncultrued dumbass" rather than "foreigner."
2)<as an insult> "He's such a gaijin! That imbread hick thinks his town is the whole world & that his way is the only way."