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Keeping this in view, what is the meaning of Ahjussi?

??) means 'middle-aged man' or 'married man' in Korean. DEFINITION 2. Ahjussi can be used when calling an unfamiliar grown man; it is equivalent of calling a man 'Mister' RELATED WORDS.

Beside above, what is a Ajumma mean? ??), sometimes spelled ajoomma, is a respectful Korean word for a married, or marriage aged woman. It is most often used to refer to any middle-aged or older woman since referring to an elder by name without a title in Korea is not socially acceptable.

Keeping this in consideration, how old is an Ahjussi?

An older guy past their 40s and a young woman in their 20s however is something that will, and does, knock our socks off. The term 'ahjussi' is normally used for older men who you don't properly know. It's almost like the equivalent of calling a stranger 'sir' or 'mister', except it's more age-specific.

Can you call your boyfriend oppa?

Oppa doesn't mean boyfriend. A three-year-old girl can call her four-year-old brother oppa. Oppa meaning boyfriend would of course make that situation impossible. However, oppa indeed is a word one can use to call and refer to their boyfriend, it just doesn't mean boyfriend.