carwash cunt
The ultimate insult. When the simple bitch or whore won't do. Usually used in arguments between two women. The "carwash" part of the insult can be replaced to fit the situation at hand.
Cheryl: Ya goddamn motherfucking bitch!
Susie: Fuck you, you carwash cunt.
Susie: Fuck you, you carwash cunt.