The song "Mistletoe" by Justin Bieber is a festive pop tune celebrating the joy and love of the holiday season. The lyrics express a desire to be with a special someone under the mistletoe, highlighting the romantic and magical atmosphere of Christmas. The song conveys a sense of happiness and unity, focusing on the connection between two people as they share intimate moments during this festive time of the year. The repeated chorus emphasizes the theme of togetherness and the joy of being in love during the holiday season.