It's the word used to describe someone so cranky and so bitchy that you drop your jaw in awe. Generally speaking, said person has the intelligence and/or appearance of a hippopotamus.
"Don't provoke me! The power was out, so I overslept, and couldn't straighten my hair, then I broke a nail! I'm such a crankabitchapotamus today!"
by Mother of crankapotamus April 6, 2010