when toilet paper has not completely removed the crap from your ass. The resulting crap ass condition will leave you with an irritated bung, causing you to walk funny.
While john was hiking in the mountains, he came down with a bad case of crap ass, and had to resort to using a leaf.
"Dude that guy is such a total crap ass for not going to the movies with you."
"That new cell phone was so crap ass because it broke right away!"
"That new restaurant is such crap ass, everything tastes really bad and is way overpriced!"