Swank Flu
A language with words that only a select few of people know of. The knowledge of these words can only be passed on to people who are deemed "worthy" by others who have knowledge of the words. Nobody knows what makes a person more worth or less worthy. You just are.
Ex: Person 1: Do you know the words of the swank flu?
Person 2: Nah bro, tell me more.
Person 1: You're too trog fandem, sorry bro.
Person 2: Nah bro, tell me more.
Person 1: You're too trog fandem, sorry bro.