"Run off smell of an oily rag" is a colloquial expression used to describe something that is unpleasant or offensive. There are several synonyms for this expression, such as "foul odor," "stench," "noxious fumes," and "repugnant aroma." Other possible alternatives include "unpleasant smell," "malodor," "bad scent," and "offensive odor." Whatever the word choice, it's important to convey the idea of an undesirable and possibly nauseating scent that needs to be eliminated. Whether you're dealing with a smelly room, clothing, or food, finding the appropriate synonym for "run off smell of an oily rag" can help you accurately describe the situation and take steps to fix it.