Top Definition
a term used to wind someone up by not answering there question or just said to just annoy in general.

usually said pitched and with a little cheeky grin and waving of the hand.
-jason : "ah fuck sakes...Will, where have you put my car keys?"
-will: "NI NW"

person bends down to sink to watch their face in the sink and looks up to the mirror to see someone behind them.

- person says "NI NW"
by joescarecrow February 05, 2010

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