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.
by gamblingcat October 30, 2007

Favoured pastime with those who are predisposed towards making intimate contact with sluts. Involves sexual intercourse with females of loose morality.
Tally-ho old chaps! Lovely night for a spot of slut cunting, don't you think? Jolly good then, let's make haste, shall we?
by biatch March 23, 2004

A phrase made popular by the young you tube sensation Bo Burnham. It is an alternative way of describing the act of fisting upon a female.
Last night as i arrived home i caught a glimpse of my neighbours wife under cunting herself.
Lucy demanded that Dave began under cunting her.
We tried to under cunting her, be she cried.
Lucy demanded that Dave began under cunting her.
We tried to under cunting her, be she cried.
by Bigbofist November 4, 2010

by Jack Pemberton November 18, 2007

by Thunderc3 March 23, 2009

The bitch is inverted with legs akimbo. Her cunt is then hammered for all its worth before a fucking large quantity of man batter is dumped therein said gaping hole. 100 grammes of bicarbonate of soda is then spooned into her messy sticky love socket before the male retreats to the couch grabs a beer and waits. The resulting chemical reaction causes an eruption of massive proportions with foam and batter and all sorts spewing out of the gaping chasm!
James had just finished destroying Cynthia's love socket with gusto when he ordered Cynth to remain in her inverted position. James then fed a large quantity of bicarbonate of soda into her stinky spam purse before making a swift retreat. The resulting eruption reminded him of his childhood experience when stuck on Mount St Helens as the cunt volcano burst forth with noise and sticky matter that ran like magma down the Valley of the Brown Death!!!!!!
by And then came the Flop September 13, 2007

by Brigand March 14, 2007
