Anjing comes from Indonesian and Malay, where it is the everyday word for dog and a common slang exclamation online. The short shouted clip spread through meme edits, gaming videos and chat soundboards as a fast reaction sound, especially in Southeast Asian communities. Because the delivery is sharp and recognisable even to viewers who do not speak the language, creators reuse it as a universal sign of annoyed disbelief. Its brevity keeps it popular for mobile edits, Discord calls and short form videos where a reaction has to land in seconds.