Lyrics have a winter theme. Christmas... winter... ya get it?
Yes, but the song was only sung at studio parties to entertain guests. A couple of studio contract actors would sing it in front of the other guests near the end of the party. A studio head asked the songwriter if they could use it for a film, and he agreed to it. This was the first time the general public ever heard the song, and it came out on record soon after by other artists.