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3.
When you are having sex and 'skeet-skeet!' on the girls face. Then, use your penis to wipe it back and forth like a windshield wiper and smear it on her face.
"This girl was doing the deadfish in bed so I gave her a Dirty Windshield."
by supergirlreceptionist November 02, 2011
 
1.
A sexual act where one person wraps his/her head in saran wrap and watches as the asshole opens and closes from another person who is crapping on thier face.
Guy 1- "I heard Tommy really loved it when Janice gave him a DIRTY WINDSHIELD"
Guy 2- "I heard that also..."
Guy 1- "Could you give me a DIRTY WINDSHIELD?"
Guy 2- " Oh but of course!"
by PA Control January 11, 2011
 
2.
placing goggles or other form of eye protection on a person and then defecating or rubbing fecal matter on the goggles.
dude last night i gave my girldfrind a dirty windshield.
by twizzle September 03, 2006