The "Buss It" challenge is basically like a She's All That challenge. The user in the video starts off in plain clothes, no makeup, and maybe glasses and their hair in a ponytail or messy bun. In the video, they're dancing to Erica Banks' song "Buss It," and once the beat drops in the song, the user drops it low and they are suddenly glammed up.
It's similar to the "Wipe It Down" challenge that was once a big thing on TikTok. In that challenge, a user wiped a bathroom mirror to the lyrics in the song "Wipe It Down" by BMW Kenny. After wiping down the mirror, the user would suddenly appear different, and often more glamorous or sexy. The "Buss It" challenge is like a new trend in a similar vein.