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1.
Definition 1: The main character in The world ends with you
Definition 2. Someone who is really really emo
For Definition 1. Neku is my favorite character in The World Ends With You!

For Definition 2.
Person 1: I'm so depressed...
Person 2: Oh come on, don't be such a Neku.
by BobDogChan January 21, 2009
 
2.
A german that lag switches.
Wow, that Neku just lag switched me.
by No Oneoooo August 13, 2011