The story
From hyper- (“excessive”) + scat (“scatophilia”), perhaps influenced by hyper (“a paraphilia involving large, exaggerated body parts”).
Etymology from Wiktionary, CC BY-SA 4.0.
hyperscat
Today it means: A kink or fetish, usually as in role-playing, fiction and art, that involves excessive defecation or an abnormal amount of feces, sometimes involving diapers. Full definition →