This word stands for "Not Intended As Offensive".

It is used as a disclaimer in typed dialog to convey that the previously or soon to be mentioned statement is a joke, or is an opinion and not an attack on anyone.

Also used for constructive criticism.

Typically used in one-time, open-ended communication such as a facebook status.
FB status: "Happy Hit A Heretic Day!" NIAO (joke)

YouTube comment: "This is NIAO, you sound like Justin Bieber when you sing." (opinion/constructive criticism)
by Meena6921 December 05, 2012

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