What's happening there is that he was going to take her out to a nice dinner at a proper restaurant....but on the car ride over he realized she was an overly yappy chick and he didn't want to be in a more intimate dinner situation with her. So he parked his car, popped the trunk, pulled the plan B Peanut Butter and Jelly picnic kit out, and walked her up to an overpass so the traffic noise would drown her voice out during the meal.