Once you've spawned into the square game, get to the location where the avatars are seen dancing (refer to the image). Here, you'll find the option to purchase the "What is Love" emote.

Roblox Twice Square is an experience built around the world-renowned group, Twice. Players and fans alike can participate in various challenges and mini-games to acquire virtual goodies of the band.

I can't teach you how to dougie cause then you'd get all of the UGCs for free, so instead use Dance for UGC codes to get some.