This is the /fistpump emote from FFXIV – which is currently a reward for a Moogle Treasure Trove event.
✊ Fist Pump can be unlocked with the consumable item: “Ballroom Etiquette – Overzealous Affirmations”.
This power-pose emote mirrors that which you see when you learn a new job/class combat skill during those quests in Heavensward (or L51-60).
So raise that fist high and roar. In short, be overzealous!
How to Obtain the Fistpump Emote
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The current Moogle Tomestone Event is the Hunt for Creation:
➡ https://fibrojedi.me.uk/ffxiv/ffxiv-moogle-treasure-trove-event/
This volume of Ballroom Etiquette costs 50 Irregular Tomestones of Creation.
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