Etymology
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From the actual Spanish words "no ni nada".
no ni na
- (Andalusia) a quick way of showing disbelief in regard to an action someone has negated or answering to an already negative question; yes, it was; yes, you did; actually yes
Yo no he dibujado eso en la pared ― ¡No ni ná, que te he visto!- I didn't draw that on the wall ― Don't lie, I saw you!