The Milly Rock began as a Brooklyn dance tied to rapper 2 Milly and his 2014 track of the same name, built around swinging both arms while stepping side to side. It spread through Vine and social video as people filmed their own versions. Playboi Carti revived the phrase for a new audience in 2017 with Magnolia, where the line became one of the song's most quoted moments. Since then the clip has stayed in rotation for dance recreations, confident entrances, and edits asking how people learned the move.