A close synonym to "Cool", except used by those who are flamboyant,or who wish to avoid stereotypes and stagnation of language. Things that are Koolioishness are more than cool. It can also be used to describe things that are new. Used in casual conversations by girls or guys who are worth knowing.
Guy: Hey someone already defined "zur" on urbandictionary!
Flamboyant Girl: Really? Koolioishness!