Brown the ground beef in a large skillet over medium heat, breaking it up with a spoon, until fully browned and no pink remains (about 5–7 minutes, internal temperature 160°F).
Drain any excess fat from the skillet.
Reduce heat to low and add the cubed Velveeta cheese and entire undrained can of Rotel Diced Tomatoes with Green Chilies to the skillet.
Stir occasionally until the cheese is completely melted and the mixture is smooth and creamy (about 5–10 minutes).
Transfer the hot dip to a serving bowl (or keep warm in a slow cooker on the "warm" setting) and serve immediately with tortilla chips, Fritos, or fresh veggie sticks.