Heat a large skillet over medium-high heat; cook and stir beef until crumbly, evenly browned, and no longer pink. Drain and discard any excess grease. Transfer beef to a slow cooker and sprinkle with taco seasoning mix and ranch dressing mix.

Add corn, black beans, diced tomatoes, and green chiles, all with their liquid, to the slow cooker. Stir black olives, onion, bell pepper, and tomato juice into ground beef mixture.

Cook on Low until vegetables are completely tender, about 5 hours.