Have to find an interior area with lots of items to lick, kick and headbutt to drive up your multiplier. I really was no where near the total until I found the Coffee Stain Studio house and went wild on the various floors (usually lick, kick and headbutting everything, making sure to do all three to each item, then doing the same while jumping). There is another house with multiple bedrooms (believe it is the house with the treadmill) that you can also do a lot of damage in.
Ahh, I hadn't been using lick or kick all that much. It seems obvious in hindsight, but I would imagine mixing the tricks up a bit probably keeps the combo going longer than just headbutting over and over, huh? That should be useful, thanks.