[gmku]

It's actually supposed to be about Dr Pepper, the soft drink, only the company sued and Lennon was forced to change the words. Originally, it was "Dr Pepper, your a new and better cola, You help me say hello-ah, I spill-a you all ovah, Dr Pepper" and that's why there's the line about "drinking from his special cup."

You can find this on the rare bootleg Love is just Evol Spelled Backwards.