Fum, Fum, Fum (m {respell|FUUM FUUM FUUM|`}; lang) is a traditional Catalan Christmas carol. It is thought to have originated in the 16th or 17th century. The word `fum` means smoke in Catalan, and it may simply refer to the smoke rising from a chimney as seen from afar, or, as indicated in the New Oxford Book of Carols, `may imitate the sound...