The phrase "fagging out" typically means to become exhausted or tired, but there are many antonyms or opposite words that can be used to describe a more energized and lively state. These can include "refreshed," "energized," "motivated," "invigorated," "rejuvenated," "recharged," "stimulated," "empowered," "inspired," "awakened," and "revitalized." Whether you're trying to describe how you're feeling after a good night's sleep or wanting to inspire yourself to accomplish a task or goal, using one of these antonyms for "fagging out" can help you convey the right message and mood.