fridgescum (fridge-scum): the gooey mess on the shelf in the refrigerator that holds the condiments.
It might be mayo, ketchup, mustard…. could be cocktail sauce, horseradish, sweet and sour sauce, a mix of all six? No matter what its base components are, the result is fridgescum. Somehow, a little bit of salsa, chutney, or whatever might be sitting on that one shelf in the door gets loose, or not capped properly, and that’s where the fridgescum starts. Some other little bottles or jars with loose lids find their way to the same shelf, and before you know it, you got a slimy mess of goo that can only be cleaned with something chemically and lemon-scented. No matter how careful you might be to prevent fridgescum from growing, somehow, it will find a way to grow, usually with the help of other household member who are not quite as careful or coordinated as those cleaning the fridge or putting up the groceries. Just check back occasionally to make sure the lids are secure, and this can be avoided. Get everything from applesauce to salsa in order, and toss out anything that is expired. This will slow the growth of fridgescum. This is also a good way to prevent food poisoning, just to be sure.
Red meat is not bad for you. Fuzzy green meat is bad for you.