Wololo comes from Age of Empires II, first released in 1999, where priests chant it while converting units for the player's civilisation. The sound became a running joke among players because the conversion mechanic could swing battles, and clips of the chant spread through gameplay videos, streams and meme edits. It later crossed into wider internet culture as shorthand for persuasion or flipping loyalty, kept alive by remasters of the game and by creators reusing the instantly familiar chant in unrelated videos.
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The Wololo chant from Age of Empires II, spoken by a priest while converting a unit, now used in memes to joke about changing someone's mind or loyalty.
Wololo is the short, rhythmic chant a priest in Age of Empires II sings while trying to convert an enemy soldier, villager or building to your side. The voice rises and falls in a playful, almost hypnotic pattern, lasting just over a second, and it is instantly recognisable to anyone who played the classic strategy game. Hearing it instantly suggests persuasion, brainwashing or a sudden change of allegiance, which is why meme editors drop it over clips of someone switching sides, agreeing unexpectedly or being won over. It turns a serious moment into a joke about conversion, without needing any explanation.