The Brief: The Milly Rock is a hip hop dance move created by rapper 2 Milly.

DEEP DIVE
Milly Rock is a noun but can also be used as a verb: Milly Rocking. The dance was choreographed by rapper 2 Milly and included in his 2014 song “Milly Rock.”
The move was made into a Fortnite emote known as “swipe it.” In 2018, 2 Milly sued Epic Games, Fortnite’s creator, for copyright over the move.
How To Do The Milly Rock
Milly Rocking is mostly based in the upper-body, involving waving and swiping hand movements, as laid out in online tutorials like this one:
#MillyRock On TikTok
Variations of this dance move can be found on TikTok where videos associated with the hashtag #MillyRock have been viewed over 42 million times. It’s also featured as one of the moves in The TikTok Song.
@jaycade_4That feeling when you hop back on #tiktok #foryoupage #foryou #fyp #dancing #kodakblack #millyrockβ¬ Challenge – pacificsoundz
@ezgizemHanging out π with johndees and angelmamii7 in #timesquare #millyrock #millyrockchallenge #travelβ¬ Challenge – pacificsoundz
@bucksGiannis learns a new dance π #millyrock #slowmotion #dance #challenge #foryouβ¬ Challenge – pacificsoundz
@lukephilip24I milly rock on any block… or on the way to clock out #worklife #dancechallenge #millyrock #fyp #fy #foryoupageβ¬ Challenge – pacificsoundz
@kylejay_Did I do this right? #foryou #foryoupage #milly #millyrock #millyrockchallengeβ¬ Challenge – pacificsoundz