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#1 TOP DEFINITION
Korean word used by females to address an older male — literally 'older brother' but in fan culture refers to a male idol the fan considers charming or attractive. Saying 'oppa' to an idol implies warmth and closeness. Male idols performing cute or protective behavior are often praised as 'oppa material.' Non-Korean fans use it liberally, often playfully.
Example
“Thousands of fans screamed 'OPPA!' when Jin walked onstage — his endearing smile is peak oppa energy.”