The phrase grew out of online meme culture in the early 2020s, when Among Us made 'sus' shorthand for suspicious and anime fans already used 'baka' as a teasing insult. Combined, the two words became a viral TikTok sound and caption, repeated in gaming clips, anime edits, and reaction videos. Its short, sing-song delivery made it easy to remix, and it remains popular because it works as a light-hearted callout that both gaming and anime audiences instantly understand.