Rawr Tyrannosaurus royale.
Can be bought from Cash Shop with 500 V-Bucks.
Rawr is the name of one of the rare emotes for the game Fortnite Battle Royale. Emotes are animations and gestures that can be activated and played at any time. These animations do not have any other function.
Roar like a dinosaur with the Rawr emote. This emote animation makes your character roar like a Tyrannosaurus Rex dinosaur and emit a long and loud roaring sound. This emote animation seems to be a tribute to the film Jurassic Park: Fallen Kingdom.