Someone who is obsessed with Korean culture so much they denounce their own culture and call themselves Korean. They usually are kpop fanatics (not fans) or fans of
League of Legends or other competitive games
popular in South Korea. However there is a line; if someone just likes the
music, language and culture they are not classed as a koreaboo.
"
That boy over keeps calling himself
Korean and all he talks about is
Korean things, he's such a koreaboo!"