A fender bender typically refers to a minor car crash on a bend. A bender is a streak of alcohol or drug use. Fender bender week is a minor crash of daily alcohol consumption with the alcohol starting with the day of the week typically in the last week before a holiday.
friend 1: why are you drinking, its a work night?
friend 2: its tequila Tuesday!!
friend 1: tequila what?
friend 2: fender bender week!! the holidays start next week.