This is Sage the Gemini, a rapper from Fairfield, CA, whose song "Red Nose" is leading the latest dance craze out of the Bay Area, called yiking.
Yiking involves dancing with a partner, shifting your weight from side-to-side, but that's really only the simplest definition.
According to these yiking experts, it's "extreme twerking."
Though yiking's been around for a bit, it's been blowing up online thanks to Sage's "Red Nose" song and video.
... The line "Shake it like a red nose" is actually a reference to the way Red Nose Pitbulls shake their heads.
In an interview with Sway on Sway In The Morning, Sage said he was thinking for a way to say "booty-shaking" without saying "booty-shaking," and the result is an extremely catchy hook that's made for dancing.
"It's a very positive movement that's going on in the Bay Area right now," Sage said in an interview with Sway. "It's sorry to say, but they don't want to put that in the media right now." (Don't worry, Sage; I'm from the Bay, I got you.)
"It'll be a blessing [for the media] to put, like, 'Oh, the kids are dancing instead of shooting.' But instead they're like, 'Oh my god, they're dancing,'" he said.