In a large mixing bowl, whisk together the mayonnaise, sour cream, Dijon mustard, and lemon juice until smooth.

Add the Old Bay seasoning, garlic powder, salt, and pepper, mixing thoroughly.

Gently fold in the crab meat until well coated in the dressing.

Incorporate the diced celery, minced red onion, and dill into the mixture.

Cover and chill in the refrigerator for at least one hour.

Serve in lettuce cups, hollowed tomatoes, or on toasted buns.