The term CIS kid (or aleternately CIS people) has gained much momentum as of late among the english speaking adolescents of Denmark. It is used to describe a person of great contempt for his peers merely due to their social or economical status. They are fast to critise everything and everyone around them, however remain indifferent to their own shortcomings.
They are in essence snobs of the worst caliber. Their friendships (if one can call them that) are more often than not superficial, and based on social context.
Hej, Joe's being a fucking CIS kid, he's pursuing some more entertaining endeavour than chilling with us.