The Brief: A series of dance moves set to Doja Cat's song "Say So" went viral on TikTok in December 2019.

DEEP DIVE
After Doja Cat broke the internet with the #MooChallenge inspired by her song “Mooo!” her music has gone viral on TikTok in the form of a dance challenge to the song “Say So,” which she later featured in the song’s music video.
The dance was developed by TikToker Haley Sharpe who uses the handle @yodelinghaley. “Say So” has been featured in over 9 million TikTok videos, many of which show people performing @yodelinghaley’s choreography. Videos associated with the hashtag #SaySo have been viewed over 154 million times and the hashtag #SaySoChallenge has received over 76 million views.
@yodelinghaleyand here’s the dance🤪🥰 and THANK YOU FOR 10 MILLION HEARTS OMG THAT’S CRAZY♬ Say So – Doja Cat
Dances are set to a clip of the song which includes the following lyrics:
Why don’t you say so?
Didn’t even notice, no punches there to roll with
You got to keep it focused, you want it, say so
The dance consists of a series of arm and hip moments. As laid out in this tutorial, several of the moves correlate directly with the lyrics including a punching movement and an arm roll.
@maskedancetutorials2 video of the day..🤔🤫🤭 #fyp #foryou #foryoupage #4u #dojacat #sayso #dance #masked #winterbreak #SpotifyWrapped #genieinabottle♬ Say So – Doja Cat
#SaySoChallenge On TikTok
@charlidameliosorry i know i do this dance a lot but i love it and yodelinghaley♬ Say So – Doja Cat
@demiskinnerI think im officially the tallest person to do this trend!?!?! #sayso #windy #scary♬ Say So – Doja Cat
@bradmondonycMe feeling threatened to keep up with the 16 year old dancing trends #dojacat #sayso #foryou #turnitup♬ Say So – Doja Cat
@goddessscaseyI have so much energy rn 😁 #sayso #fyp #icantdance♬ Say So – Doja Cat
@treclementsvibe check😍 dc: yodelinghaley♬ Say So – Doja Cat
@avani100% with bae 😛 annieleblanc ( dc: yodelinghaley )♬ Say So – Doja Cat