The line comes from The Legend of Korra, the animated sequel to Avatar: The Last Airbender, where the flamboyant inventor Varrick frequently orders his loyal assistant Zhu Li to do the thing, often without explaining what the thing actually is. That running joke made the phrase instantly recognisable to fans, and the shortest, punchiest delivery was lifted as a standalone meme clip. It spread through soundboards and short-form video edits, where its vagueness is part of the appeal, because it can be dropped over almost any moment of sudden action.
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Varrick's short command from The Legend of Korra telling Zhu Li to do the thing, used as a quick hype sound for memes and edits when it is time to act.
This is the split-second moment when Varrick, the eccentric inventor from The Legend of Korra, turns to his assistant Zhu Li and delivers the now-iconic instruction to simply do the thing. The voice is urgent, confident and a little manic, landing in under a second with no build-up and no pause for doubt. That abruptness is the joke and the power: it cuts through hesitation and turns an ordinary task into a mission. Played over a clip, it instantly makes the next action feel decisive, chaotic and funny, as if the character has just been given permission to go all in.