A charming, helpful and funny guy who will do anything for you, but will stab you in the back in any form of competition.

Can also mean someone who has a hairless bottom and is smooth all over.
Damn, did you see that smooth chest? He is such a Neysan”.

“I can’t believe you were the Mafia all along. You totally Neysaned me!”
by Giemi July 22, 2019
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