somebody younger than you who believes that they are 'cool' and therefore feels that they are able to follow you and copy you.
Oh my God Amiee, your little sister is such a kerg
To be awkwardly and annoyingly pretentious and informative. Completely unnescessary and overly dramatic with an unwarranted superiority complex.
Dave: Why is he telling me this?
Matt: Because he is a Kerg, just nod and smile.