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derived from Caribbean patois.
used as a declarative: meaning incorrect, immoral or unjust
wha de bumbaclaat gwan? dat nah right, mon.
by top shotta February 22, 2006
No huh? Or, You can't do that for me right?

Nah Right? started out being used as it is above. Now, it has grown into a global phenomenon and is widely used in the media and poupular culture.
Person 1: "Do you think you can pick me up from school later tonight?

Person 2: "I don't think I can."

Person 1: Nah Right?
by skaybn January 26, 2004