Hackopotamus 

A creature who refuses to improve an existing skill set.

Did you see that guy's work? What a hackopotamus!

Hackopotamus by ChrisN_PGH March 5, 2011

hateopotamus 

An obese person who propagates hatred towards any and all things.

Who let tha Hateopotamus out of the zoo? ; Someone better put that Hateopotamus on a leash.

hateopotamus by the.shine. May 23, 2010

jackopotamus 

Short and to the point, a fat man who jacks off, or a fat man that hasn't been laid and has no other choice.

"Looky here a jackopotamus, poor bastard."

jackopotamus by Ashmarie November 30, 2006