1. Derived from the words "cunt" and "whore," it is used to express that much more disgust with a female than it's roots.
2. A female of ill repute to say the least; worse than a prostitute because she does it for free - hence she has nothing to show for it aside from the nut on her face.
Dude, the whole crew has boned her, she's a filthy cuntour!
Kiss you? Kiss a skeezy cuntour like you? You gotta be fucking kidding me!