A hippiepotamus is a fat kid whos a hippie.
A hippiepotamus is just a random stupid name you call kids with long hair (e.g. Skaters are examples of hippies. They are the worst part of the hippies... the physical assets. They lack the spiritual beliefs, but they look like hippies.)
James Douglas is a skater who has long hair. Therefore, he is a hippiepotamus.