The belief in whatever one wants to believe in. A religion in which there are no rules, but the ones that one makes, hence the title "Jawnism"
Jermaine: Man Jawnism is the greatest thing ever
Jamal: What is it?
Jermaine: I can believe whatever jawn I want! Like in my Jawnism therse a lotta jawns and im the jawn of the jawn. Every jawn in the jawn is owned by my jawn and i live happily ever after in a giant jawn and I never have any jawns.
Jamal: Dawg that sounds fly.