A shakezilla is a ginormous bear that can do many to all things. It is athletic, and can play the following; football, basketball, baseball, lacrosse, tennis, and even chess. It is also rumored to make goat noises and can whoop ass.
The dildo of all dildos. Basically that special dildo that makes a girl (or guy.. if you're into that shit) insta-gasm. Shaftzillas are usually rather large, they fuck shit up, and they get the job done.