What dance craze of the late 2010s involved a distinctive arm-swinging motion and was popularized in hip-hop?

The dance craze that captivated the late 2010s with its distinctive arm-swinging motion is known as the Floss. This viral dance involves rapidly swinging stiff arms, with clenched fists, from the back of the body to the front on each side, often in the opposite direction of the hips. The name "Floss" cleverly describes the movement, as it looks as though the dancer is using a giant, invisible piece of dental floss. This simple yet infectious choreography quickly became a global phenomenon.

The Floss gained significant traction and widespread recognition thanks to Russell Horning, famously known as "the Backpack Kid." Horning’s deadpan performance of the dance while accompanying Katy Perry during her "Swish Swish" act on Saturday Night Live (Review) in May 2017 catapulted the move into the mainstream consciousness. His unique style resonated with audiences, and videos of him performing the dance rapidly spread across social media platforms, making the Floss a household name.

The dance's popularity was further amplified by its inclusion in the immensely popular video game Fortnite Battle Royale, where it appeared as an in-game "emote" that players could perform. This integration exposed the Floss to millions of players, particularly children and younger teens, solidifying its place as a cultural touchstone of the era. Its energetic and rhythmic nature also found a natural home within hip-hop culture, where new and engaging dance moves are frequently adopted and shared, contributing to its enduring legacy as a memorable fad.