nn literially means night night, but maybe used as "cya"

Used in online chatting.
Representational of a happy face, similar to but not as popular as ^_^
Opposite of u.u

Smilie for blushing

Simply means no namer. A no namer is a person that no one other knows. Mainly used online and in communities, many people toss the word around for not being well-known and having no friends.

short for "no need" this is trading slang in the game Diablo 2 for I do not require any of the items you have shown me, a "ta" after indicates that the quality of said items is high and that you simply do not require them , a nn noob means that you think the items are poor

Nearly Nude, as in almost nekkid