The phrase "bugged up" typically means something is malfunctioning or not working properly. Some possible antonyms for this phrase could include "functioning smoothly," "operating efficiently," or "working flawlessly." Other antonyms might include "fixed," "repaired," or "reliable." Essentially, any word or phrase that suggests that a system or machine is running as expected and without issue could be considered an antonym for "bugged up." It's important to note that antonyms can vary depending on context and usage, so the best antonym to use may depend on the specific situation.