"MEX SO" refers to a term or concept that might not be commonly known. However, there are numerous synonyms that can be used as alternatives to communicate a similar message. For instance, one can employ words like "extraordinary", "exceptional" or "remarkable" when trying to convey the concept behind "MEX SO". These terms showcase something out of the ordinary or above the average. Additionally, synonyms like "outstanding", "impressive" or "noteworthy" can effectively convey the idea of excellence. By incorporating these alternatives, one can express the same sentiment as "MEX SO", while employing a vocabulary that might be more familiar and easily understandable to readers or conversation partners.