This song is all about Christmas and the overall Christmas spirit. Songs like these help people get into the Christmas vibes, which is why they love listening to these songs around Christmas time. In this song, all the things associated with Christmas, like a mistletoe, pumpkin pies, Christmas trees etc are mentioned. The singer is basically saying that whenever people listen to Christmas carols like deck the halls, they feel this weird sense of happiness and excitement in themselves. Due to this happiness, they dance around and enjoy with their friends and family.