Someone who can be cool, but is often calculating your every move on the inside. They can be deceptive and decietful, and appear to be all knowning at times because of people's predictability.
They often prey on your weaknesses, and notice all of your flaws just by looking at you.
However because of their ability to see indefinite flaws, they wind up hating themselves, because they see all of their own flaws in extreme detail.
In general, "Viper" would be the
name for your sneaky, slightly
badass, tough friend who's skilled at many things the
average biddy would never dare to
try.
I didn't notice how
bad Jimmy's
acne was until that Viper pointed it out.
She's such a viper, she looks all
sweet but she's just using him for gossip.