In a large bowl, combine the chicken, dill pickles, celery, red onion, green onion, and dill.
In a separate bowl, whisk together the mayonnaise, sour cream, pickle juice, Dijon mustard, salt, and pepper.
Pour the dressing over the chicken mixture and toss until evenly coated.
Enjoy immediately, or for best flavor, cover and refrigerate for at least an hour before serving.