* Older brother (although it doesn't necessarily imply a blood relationship)
* Boyfriend (when used in a romantic context)
* Older male friend (in a casual and friendly setting)
The specific meaning of "oppa" depends on the context and the relationship between the speaker and the person being addressed.
It's important to note:
* "Oppa" is not used by men.
* The use of "oppa" is generally considered informal and should not be used when addressing someone significantly older or in a formal setting.
* In recent years, "oppa" has also gained popularity in other parts of Asia, particularly among K-pop fans.