We are about the same age, but I remember it as Jingle Bells, Shotgun Shells..... Rabbits all the way!!!!!!
I was driving the family north from Naples to Rome on the Autostrada del sol in about Dec 1976. My sons were singing it. That was the first time I’d heard it. Also heard the “you smelt it, you dealt it,” and “who denied it supplied it” mantra as well.