AT QUQJIQGWIWGWI appears to be a user uploaded soundboard clip with no confirmed source work, character or creator attached to it. Its appeal comes from internet keyboard smash culture, where random letters stand in for speechlessness, panic or laughter. Short nonsense clips like this circulate on soundboards and in meme edits because they work without any setup or translation. It remains in use as a deliberately meaningless reaction, posted when a normal word or sound effect would be too clear for the moment being mocked.