1 definition by h0ttsAuCE808
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