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Wololo is the sound made by the Priest unit in the 1997 game Age of Empires. It is used as an interruptor, causing the color of something to change colors between red and blue.
Wololo originates from a unit, or class, of characters from the first installment in the strategy game series Age of Empires produced by Ensemble Studios and released in 1997 by Microsoft.
The Priest units can both heal and convert enemies to their team. When a member of the opposing team is converted, their outfit switches color to show their alliance to the new team. While the priest is converting the player, he makes a noise similar to “wololo.”
Both images and videos with the sound have been posted, with Wololo for 10 minutes being the most watched -- over 250,000 views since February 2009.