Kennen is a yordle ninja champion in Riot Games' League of Legends, which launched in 2009, and this clip comes from his in-game voice set of short attack and movement grunts. Like many champion voice blips, it was ripped to soundboards by players who wanted quick reactions for edits and streams. The hoiyaaa gained traction because it is instantly recognizable to League fans yet works without context as a funny little battle cry. Its sub-second length keeps it useful for memes, montages and comedic timing.