An insult inferring that the reciever is a walking joke, including their actions, habits, appearance, and ultimitly, their existance.
You have no room to talk, clownshoes.
I ran into this guy who was the biggest pair of clownshoes I've ever seen.
"So you had sex with a girl named Clownface? What does that make you, Clownshoes?"
-Tucker Max from his Maxim Radio show.