I'm sure you mean the song "You're a Mean One, Mr. Grinch" by Thurl Ravenscroft. That's the song that plays during the opening credits of the classic animated TV special. The lyrics go like this: "You're a mean one, Mr. Grinch, you really are a heel. You're as cuddly as a cactus, you're as charming as an eel, Mr. Grinch. Your heart's an empty hole, your brain is full of spiders, you've got garlic in your soul. Mr. Grinch."