What is an 'ism'?

An ism is a brain fart or to sound less childish it is when your tongue and your brain disagree with each other and what you meant to say comes out wrong.

Why do I have a page dedicated to isms?

I am inspired by my brother, Billy. He comes up with the most hilarious isms and one day I started to write them down. They most likely won't make any sense and isms probably quailify as one of those "you had to be there" situtations. Isms comes from the word 'Billyisms'.