It means "now" in a more bashful and impatient way.
Used a lot in forums or discusion/image boards like "chans" or gamefaqs.
Picz na0 or it didn't happen!!1!
John: I'm hungry
Mom: It will be ready in......
Guy 2: But theres no where else to go, we've been everywhere!
Girl: Lately, there hasnt been anything to do, ugh im so bored right about NAO.
Girl 2: I feel you sistuh.
This word 'nao' is used widely throughout the youth of today and is another way to say 'no' but in a more aggressive and slangy way.
The use of the word is to say to people that have done something wrong or do not understand something.
You are condemning them.
Get that dudu.. Naooo
Relevant in many contexts; generally to exacerbate the embarassment of a failed joke, but perhaps specifically directed at an individual, preceding the target's name, or title, in order to indicate their knob-headedness.
Old Fisherian in its etymology, derived from the older expression 'nao barry'. Common in south london area. Spread faithfully nation-wide by alumni.
'Nao your life'