Antonyms for the phrase "most tip top" may include terms like "worst," "shoddy," or "unexceptional." These words connote a sense of mediocrity or inferior quality, in stark contrast to the positive implications of the original phrase. Other antonyms could include "second-rate," "inferior," or "subpar." These terms suggest that something is substandard or inadequate compared to what is considered desirable or satisfactory. Overall, the choice of antonym will depend on the context in which the phrase is used, as well as the specific qualities or characteristics that are being evaluated.