A person ages 12-45 that like WWE Wrestling and will think that it is real no matter what you say. The adjective "Niss" May also be used by a

Nissy Boy that he/She may think is cool.
Oh Niss!

That Action figure is soo Nissy!

That man sure does like WWE Wrestling...He must be a Nissy Boy.
by NissyBoy May 12, 2013

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