The Smile Sweet Sister Sadistic line comes from the opening theme of the 2017 anime Blend S, where cafe staff introduce their assigned character traits in a rapid alliterative chant. Online, the chant became a reusable meme template, remixed and reposted in many edits, including versions paired with Snoop Dogg whose name extends the S wordplay. Short soundboard clips helped it spread beyond anime fans, and it remains popular because the rhythm is instantly recognisable, easy to time to poses, grins and character introductions in short videos.