staining the back seats is when you engage in sexual activity in the back seats of a car. In most cases, stains are left from the sexual activity the occurred in the back seats, hence the name, "stain" the back seats.
Chris asked Stacy if she wanted to stain the back seats with him and she rejected him and called him a pervert.
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Back seat shifting, to get or give a hand job in the back seat of a car.
See: Paris Hilton shifting in the back seat of a '68 Camaro.
... for fucks sake, Back seat shifting.
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someone who is frequently fucked in uncomfortable and awkward places i.e. the backseat of a car
Tyler's mom is a back seat bitch, in fact last night i fucked her in the back of my geo metro. I had a charlie horse all week!
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Sex postion involving three men a women and a car. The woman sits reverse cowgirl on the first man in the middle backseat while giving handjobs too the other 2 guys that are in the driver and passenger seats.
Dude that chick is a total back seat driver, trust me i know from experience
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An annoying twat who sits behind you just watching you browse the internet or my documents. Anything. Anything they can get their watchful eyes onto. This could be you brother, your best friend or a stranger at the libary.
Person 1: What's Tim doing.
Person 2: oh he's just Back-seat Browsing on Percy over there.
Person1: Does Percy know?
Person 2: Hell no man, otherwise he would be so pissed.
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Term meaning WHORE when there are seven year olds in the room.
"You don't want your identity to be the biggest back seat baby in the school."
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A baby conceived from having sex in a car, usually, but not limited to, the backseat.
Because Ricky and Charlotte have only had sex once, in the back-seat of his car, and she is now pregnant, her child would be considered a Back-Seat Baby.
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