It's the Rick Dance.
The Rick Dance dance is a Epic Fortnite Emote. Is Part of the Rick, C-137 set.
This emote was added at Fortnite Battle Royale on 8 June 2021 (Chapter 2 Season 7 Patch 17.00).
This gesture is one of the Fortnite Battle Pass cosmetics in Chapter 2 Season 7. You can get it once you have reached Tier 90.
The Set Rick, C-137 contains 9 cosmetic items.
The gesture The Rick Dance belongs to Chapter 2 Season 7. This gesture is available as a reward by unlocking Level 90 of Battle Pass from Chapter 2 Season 7.