lol i have no idea what that even means pac hyderm
Pachydermata (from two Greek words παχύς pachys, "thick" and δερμα derma, "skin", meaning 'thick skin') is an obsolete order of mammals described by Gottlieb Storr, Georges Cuvier and others, at one time recognized by many systematists. 
Because it is polyphyletic, the order is no longer in use, but it is important in the history of systematics.
Cuvier's Pachydermata included the three families of mammals he called Proboscidiana, Pachydermata Ordinaria, and Solipedes, all herbivorous.
They are now divided into the Proboscidea, represented among living species only by 
three species of elephants; the Perissodactyla, or odd-toed ungulates, including horses, tapirs and 
rhinoceroses; the Suina, or 
pigs and peccaries; the 
Hippopotamidae; and the Hyracoidea, or hyraxes.
Basically, Sevastase is calling UkJeff a Pink Thick Skinned Hippo... 