What is the floss? A dance move created by the backpack kid. He performed this move whilst on Katy Perry's live performance. How to do the floss? 1. Start with your hips pushed out to the left and you arms pushed out to the right. 2. Swing your hips to the right and at the same time swing your right arm behind you and left in front. 3. Swing your hips back to the left and both arms out to the right. 4. Swing your hips back to right and swing both arms in front to the left. 5. Swing your hips to the left and swing left arm behind you and right in front of you. 6. Swing your hips to the right and both arms to the left. 7. Swing your hips to the left and both arms in front of you. 8.Repeat steps 2 to 7. Check out the video below to see how it's done.