"Piss-poor" is a slang phrase used to describe a very low or inadequate level of quality or performance. However, if you're looking for synonyms for this derogatory term, consider using phrases like "terrible," "awful," "miserable," "abysmal," "pathetic," "lousy," "wretched," "shoddy," "inferior," "subpar," or "unsatisfactory." These words are a much more polite way to convey the same level of disappointment or dissatisfaction. If you're in a professional setting, it's always best to avoid using foul language or inappropriate slang terms and opt for more refined vocabulary instead.