Some background from a commenter on YouTube:
These are the male dancers from the Radio City Christmas Spectacular (I used to work there). This is a spoof on the 12 days of Christmas performance that the Rockettes perform in the Christmas Show. Every year all the performers put on a variety christmas show and the guys put this together and it was hilarious! I watch it every year and they really did do a fabulous job with it. If you've ever seen the show, their moves are EXACTLY the way the girls perform it in the show.