A condition which you feel like you have to go to the bathroom, but you can't shit. Constarrhea is a combination of constipation and diarrhea.
My dog has constarrhea. I think he has to go, but he wouldn't shit.
A terrible state of having Diarrhea and Constipation at the same time. Usually results in having people tear their clothes of and lose feeling in both legs.
"Hey why wasn't Ashlee at the party last weekend?"
"Man it was terrible she got constarrhea"
"What the shit is that?"
"An awful anus pain that leaves your legs paralyzed."