In a large bowl, combine the sour cream, taco seasoning, shredded Mexican cheese, and drained Rotel tomatoes.
Mix all the ingredients together until they are thoroughly combined.
Transfer the mixture to a serving dish.
Cover the serving dish tightly with plastic wrap or a lid.
Chill the dip in the refrigerator for at least 2 hours, or preferably overnight, to allow the flavors to meld.
Serve the dip cold with tortilla chips, crackers, pretzels, or your favorite vegetables.
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