when a car that someone had sex in is left with sexual residues, like snail trails and cum stains, on the seats, carpets, door panels, steering wheel, stick shift, etc.
Jason: I just banged my girlfriend in this car at a cemetery. Look, there's still cum stains on the back seat.
Marco: Awe man, you're disgusting. Let me out of this sloppy jalopy.
A sloppy jalopy is a sexual act for partners very comfortable with each other. During fellatio, when the man is about to climax, he pushes the girl away, cums in his own hand and smacks the girl in the face with it. This is called a sloppy jalopy.
He gave me a sloppy jalopy. It was so romantic.
The act in which you shove your whole dick into a cup of ice cream and then start thrusting into a vagina which has been thickly covered in whip cream, all while your getting an expensive haircut in a barber shop.
I was giving this hobo a sloppy jalopy last weekend.
When you ejaculate on your hand during intercourse and you slap your partner.
Johnny : so earlier we was doin' the nasty right...
Kevin : Yeah
Johnny : and I was like yo jenny, lemme try this new move called the sloppy jalopy
Johnny : she was like what the fuck is that
Johnny : I tell her its this new crazy that everybodys doing so she says ok
Johnny : so then I like ejaculated in my hand and like slapped her in the face
Kevin : .......
Johnny : yeah man it was fucking raw I tell ya
Ejaculating into your hand and then preceding to slap dat bitch across the face.
Lui Kang gave Kung Lao a sloppy jalopy.