a freakishly large dick that is usually very, very hairy and ugly.
or a person that acts very stupid and retarded.
This can range from saying something mean to just acting weird.
Josh: How was last night?
Emily: Totally great, he had a total nin.
or
Natalie: Wow! I didn't know trees were green!
Jaclyn: You are such a nin! Trees are always green!
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