Noona is a word used by korean males to address female older than them who they are close to (biological or not).
It's often used in a romantic relationship when a guy refers to his girlfriend (or the guy hitting on a girl) who is older/same age as him.
Noona literally means "older sister"
The female version of this word is Unni.
Do you want to go on a date with me noona?
I told noona that I'll come home early today.
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