Somone or something be violently stepped upon by heavy persons or creatures is called the hippo stomp. This is especially true when done with vigor and malice.
A German Shepherd dog belonging to a hippie that exists on the cheapest food - sometimes handouts, no veterinarian care and no obedience training. These usually friendly dogs often can be seen with beggars on median strips or sidewalks, and often end up on animal shelters if the hippie is jailed, moves away or just doesn't want it anymore.
When a guy's fat gut is so huge it resembles a hippopotamus head ... it therefore must be a hippopotamus that only has 2 legs and has purchased itself a lovely man's head for a hat (probably not such a lovely hat given the size of the gut)