A Total Maniac is someone who tries way too hard to come off like a punk rock sleazeball. They perform a corny caricature of 'sex, drugs, and rock'n'roll', only when they don't have to be in the office tomorrow. A particular breed of "weekend warrior", from the poser genus.
"I bet Dustin would huff some duster with us"
"probably not, he's all talk, total maniac."