Parked in the Alley
Similar to being Parked in the Red Zone. Parked in the Alley refers to when a girl will not put out anal sex for you and only allows vaginal sex. Despite efforts to slip it in the old bunghole you are refused entry and will never be able to do more than to slide your knob between those cheeks and around that bung but never go deep.
Dan was constantly trying to knock on Dana's back door. Despite the coaxing, she always left him Parked in the Alley.