A Brett Willis Perriam refers to a person going through a mid life crisis at an early stage of life, More than likely a raging alcoholic with an urge to Bed a toothless wool handler on the regular basis. (Brett Willis Perriam was known to be an alcoholic, pickpocket and thief around the victorian age)
Joe Bloggs: I'm definitely drinking and making love to a creature tonight after fleecing a thousand dollars on the pokies. after Jordan: Oh mate, you're a bit of a Brett Willis Perriam.