1In a medium mixing bowl, add the mayonnaise, ketchup, and smoky barbecue sauce.
Sprinkle in the ground onion, ground garlic, black pepper, cumin, and salt.
Add the vinegar and sugar to the bowl.
Whisk all the ingredients together until the sauce is smooth and well combined.
Taste and adjust seasoning if needed.
Cover and refrigerate for at least 30 minutes to allow the flavors to meld.
Serve chilled as a dip, spread, or sauce for your favorite dishes.