A cat's poop residued arsehole.
"I would never own a cat because I don't want to have to stare at it's dirt flower all day."
by Hoshiko February 22, 2005
A cat's anus. Can also be used for a human's anus. So called because the poo crusted anus of a cat looks like a dirty flower.
"tell that cat to get it's dirt flower off my couch"
by ZZZIIIPPPYYY February 22, 2005