The wololo chant became famous through Age of Empires, where priest units used it while converting enemy units, and the sound quickly escaped the game into memes. This ultimate Cogu version, credited to Switch, stretches that familiar cry into a longer wololololololo used on soundboards and in short edits. Online, it survives because everyone instantly reads it as conversion or mind control, even without seeing the original game scene. It remains a shortcut for that joke.
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Ultimate Cogu's wololololololo sound effect is a drawn out chanting cry used as a meme reaction for brainwashing, converting or hypnotising someone.
This clip is a long, exaggerated wololo chant stretched into a looping wololololololo cry that rises and falls like someone casting a spell. The voice keeps repeating the same wobbling syllables without pause, getting funnier the longer it goes because it sounds completely serious. It turns an ordinary moment into a fake mind control scene, as if the target has suddenly been converted and has no choice but to obey. That deadpan absurdity is why it lands so well as a punchline.