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A shitty carwash is when you cum on a someone's face, then use your dick as a windshield wiper. Alternatively, you can use your hand in a back and forth action. You can also add carwash sound effects as you see fit.
I gave her such a shitty carwash last night, she couldn't see for 10 minutes.

OMG. I think he gave me a shitty carwash. He came on my face then kept rubbing his hand across my face making this awful squeaking noise.
by endearing asshole June 09, 2009
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