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.
by h0ttsAuCE808 October 6, 2009
See: Paris Hilton shifting in the back seat of a '68 Camaro.
... for fucks sake, Back seat shifting.
... for fucks sake, Back seat shifting.
by Louis_Cali June 28, 2007
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!
by analboy69x89 October 19, 2008
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.
by crackaty January 9, 2011
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.
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.
by The hidden undermass June 23, 2011
by VapoRub Baby April 30, 2006
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.
by Charlotte Lyons March 21, 2009