flavor nazi
a food or sauce that is ment to compliment a main food item (i.e. ketchup on a hotdog or vinegar on a sandwich) and replaces it with its own strong flavor.
The following are flavor nazis:
1. Bacon (i.e. in a hamburger or sandwich other than a BLT)
2. Ketchup
3. A1 Steak Sauce
4. Vinegar based sauce