Definitions by Korean Terms

Oppa 

Oppa is a Korean term usually meaning an older male such as an older brother, male friend, and can also be used while Flirting
Ways people say Oppa

Oppa! Did you eat my ramen!
Oppa, what are your classes today?
Oppa, you are looking extra handsome today!

Oppa by Korean Terms August 27, 2018

Hyung 

Borrowed From Google
Oppa (오빠) and hyung (형) mean 'older brother', noona (누나) and unnie (언니) mean 'older sister'. However, the meaning of these terms expands much further than just your blood related siblings

Hey Hyung, how was your day?

Hyung by Korean Terms August 27, 2018