Hehe its an old silly song called "Christmas is Comming." Here is the real lyrics.
"Christmas is comming the goose is getting fat
Please put a penny in the old mans hat.
If you havent got a penny a half penny will do
If havent got a half penny then God bless you."
It repeats that line over and over again. The person would sing it first all the way through and then two other guys would follow with the same lyrics. As it becomes this silly tune.
Have you ever listen to Muppets Christmas Carol? Miss Piggy sings with Gonzo and Scooter this silly song.
Its just a cute little short tune.