Dirt Horse 

An insult used when someone does something so ridiculous and/or unnecissarily painful that normal insults are inadequate.

Hey, nobody wants to ride a dirty horse.

"Dude, yesterday Tom bit me in the wenis"
"Did he break skin?"
"Yea, he's such a dirt horse"

Dirt Horse by AKAthecheesegrater April 16, 2010

Dirthorse

when someone is beyond the capability of being called a skank therefore leaving the only possible insult being "dirthorse"

Wow, i never realized Amanda is such a fuckin dirthorse after she got a train ran on her that lasted four hours.

Dirthorse by wahhwickawahwahh August 8, 2008