Brian’s Got a Brand New Bag is episode 04 of family guy season 08. It was originally aired on November 8, 2009.
Peter buys a Roadhouse DVD and decides all of life’s problems can be solved by kicking things. When he and Brian get into a car accident, Brian meets a young girl and sets up a date. The girl ditches him for another guy and Brian ends up dating the girl’s mother, becoming the laughingstock of the family.