Children's cheers like this one have become a staple of online video because they instantly signal joy without needing any words to explain the joke. The elongated yay format is especially popular in short-form edits, where a stretched-out reaction can carry a punchline, a win or a surprise across a cut. It sits alongside other excited reaction sounds used by meme creators to exaggerate happiness, and it remains popular because the sound feels spontaneous, innocent and immediately recognisable to viewers of all ages.