Noona

[Little_Girl]

A Korean term used to refer to an older girl (older sister).

[Britney]

Noona is a word used by korean males to address female older than them who they are close to (biological or not).

Its 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].

[Justin Bieber]

Noona is when you decide to slope off for some lunchtime nookie. It is only at lunchtime between the hours of 12-2pm. It can be with someone you know or a new friend.
It is also preferable to have noona in interesting places, like on car bonnets, in parks, on your boss desk You get the idea.