The Glomtrommick is typically the size of a small dog.... until you piss it off. Then it grows to about 3 stories tall and will then promptly consume you and any unlucky humans standing around and destroy a couple city blocks. If he feels like it, he might key a couple cars as well.
Once he's worked all that off, he'll shrink back to his smaller size, pee on your shoe that fell off, and then saunter off into the sunset. So don't piss off a glomtrommick.