below from SC2trans, with permission, <333:
What Does That Mean?
* Hyung (형) - older brother. This is what guys call guys who are older than they are.
* Nuna (누나) - older sister. This is what guys call women who are older than they are.
* Dongsaeng (동생) - little brother/little sister. Sometimes older people will refer to younger people like this, but not always.
* keke (ㅋㅋ) - this is a laughing sound, kind of like hehe or lol. Another variation is ㅎㅎ, like haha or lol.
* name-ie (ㅇㅇㅇ이) - just a cuter way of saying someone’s name, like Junghoon would become Junghoonie, or Jaedeok hyung would become Jaedokkie hyung.
* name-ah (ㅇㅇㅇ아) - similar to the above, this is how friends call each other, or older people call younger people. In a way it’s kind of like “Hey, (name).” - Minchul-ah is kind of like “Hey, Minchul”. Younger people wouldn’t say this to older people.
* title-nim (ㅇㅇㅇ님) - adding “nim” onto the end of a title, like Yohwan hyung-nim, makes it more respectful.
* Fighting (화이팅) - Koreans often use the term “Fighting” to mean like “good luck” or “you/we can do it!”