1)(noun): a girl that wears too much make-up
"Hey Marc you see that clown whore over there? I'd get gummy from her but I might disturbe the small eco enviorment she got growing on her face"
A prostitute or slut (or any woman really), donning make-up to such extremes so as to render her face a likeness to that of a circus clown's. Generally this would involve lots of of vibrant eyeshadow, blush and lipstick.
The Red Light District and Las Vegas, for example, is full of clown whores