Woi anjing comes from everyday Indonesian and Malay slang, where woi is a blunt way to call out to someone and anjing, literally meaning dog, is used as a rough exclamation rather than a literal insult. The phrase spread online as a short WhatsApp voice note and reaction clip, passed between friends for teasing, scolding and comic surprise. Because it is only a few seconds long and instantly recognisable to Indonesian speakers, it keeps circulating in meme edits, group chats and prank videos as a quick, punchy reaction.