When you are fucking a girl while fingering her butt and realize there is shit on your finger and stick it in her mouth to clean the dookie off.
I stuck my finger in beckies ass and there was shit on it, so I had to give her a mexican car wash.
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This is what happens when there is sex on top of the hood or trunk of a motor vehicle during the winter and some of the "residue" freezes to the vehicle.
"Jenny and I were really going at it on the hood of her car outside the hockey rink. I pulled out just in time, but it totally froze to her car! Jenny yelled at me for giving her car a Canadian car wash!"
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when you get four or more guys to spank each other off and then blow on a chick on the hood of a car covered in feces
oh my god we gave that chick a cincinatti car wash
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The Holy Grail of sexual positions.
They say it has been around for thousands of years, but only a select few know how to do it exactly.
I came close to figuring out the mexican car wash yesterday.
They say the Mexican car wash is fatal 53% of the time..
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The act of defecating on someone and cleaning them off with your urine.
Susie was a little freaky so I gave her a Sioux City Car Wash.
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When many guys hide in a closet when one of their friends is boning a chick. The guys in the closet are jacking off and right as they are about to jizz they all pop out of the closet at the same time and drench the female in their semen. Professionals will try to aim for the female's eye.
Yo, me and my friends Kansas City Car Washed that chick that Victor was having sex with
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The act of spraying an excessive amount of washer fluid (especially on sunny days) on the car behind you after you've pulled in front of them. Typically used to serve vigilante justice to an inconsiderate left lane bandit.
Man, there were so many left lane bandits out there yesterday, that on a 2 hour drive I went through 3 gallons of washer fluid handing out the ole left lane car washse.