When referring to something that is "most gassed up," it usually means that it is exaggerated or hyped up beyond belief. Synonyms for this phrase could include "overhyped," "overblown," or "exaggerated." It could also mean that something is overly praised or given too much attention, which could be described as "overrated," "inflated," or "overemphasized." Alternatively, the term "most gassed up" could refer to someone who is inebriated or heavily influenced by drugs, which could be replaced with phrases like "intoxicated," "under the influence," or "drunk." Regardless of the context, there are plenty of synonyms available to accurately convey the meaning of "most gassed up".