This sound is associated with Killua Zoldyck from Hunter x Hunter, a widely known anime and manga series. Short voice lines like this spread through anime edits, reposted reaction clips and character compilations on social platforms, where fans use them as quick emotional punctuation. "Baka" is especially reusable because it is instantly understood by many anime viewers and carries a light mocking tone. That mix of familiarity, brevity and character recognition has kept the clip popular in memes and fan edits.