One who is, or will be a person that does very stupid or dumb stuff, popularized in the movie 'Brokeback Barnabus'using its alternate definnition which refers to a homosexual mans tendency to perform gay sex acts, resulting in a 'shit dip.'
Example 1: Luke: "Gee, lets go pour milk on the snow! That'll really stick it to the man!"
Don: "Luke, you ar such a shit dip!"
Example 2: Barnabus: "Hey boys, you want to play?"
Phillip: "Barnabus, I'll shit dip with you any day!"
The clinically diagnosed brain does ease that causes one to act like Alec Lingo. Symptoms include, stupid fucking decisions, commonly forgetting important and unimportant things. Overall causes the patient to be on fucking retard