The curious phenomena by which men traveling in the back of large jostling vehicles (busses, vans, ect) tend to achieve spontaneous erection due initially to the jostling of the vehicle and then secondarily to the jostling of their own wood against their legs and/or pants. This erection can often be relieved only by extrication from the back seat.
Cody: Holy cow have I got a case of Back Seat Syndrome.

Matt: Boner city?

Cody: Worst ever. Switch me spots.
by Lord Azaldon April 19, 2013
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So i was driving down the road and i looked back and saw Tom Lewis back seat tomming
by Fike Moster January 11, 2009
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When you and your better half make out or more in the back seat of a vehicle
Girl: Would you like to play back seat bingo tonight by the lake?

Guy:Heck yea!!!! I just got the back seat, of my whip, reupholstered.
by daddybigbuks September 11, 2009
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When a Sneakers O'Toole look-alike has a cab service from school to the club. Sneakers O'Toole then lets every chick in his car drink, and inevitably, they spill some cranberry/vodka on his seat. Sneaker O'Toole will get the drink stain confused with a Virginia Slim stain.
Sneakers: Yo man, I'm gonna have to run by the cleaning section. Someone spilled some shit in my car. Now I think I have the Back-Seat Stain

Grinnell: Actually, I think it may be a Virginia Slim stain.

Sneakers: You know... that may actually be what it is.

Sid: What the fuck!! Hahahahahahahahahahahahah!!!!
by Grinnell April 18, 2008
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guy 1:I'm gonna screw her in a very uncomfortable place
guy 2:What, like the back seat of a Volkswagen?
by Fly_Girl September 19, 2006
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When a person tries to act like a mod or an adminstratior of a forum. They are general pain in the ass, piss people off and so on.

They are supreme butt-kissin' suck ups.
Look! She's back seat moding!

Stop back seat modding!

No one likes a back seat moder.

by A. Raptor April 4, 2006
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That annoying person who sits in the back of the car, pointing out every flaw in your driving and telling you how to drive.
Joe: You just passed Sesame Street, dumbass and maybe next time you should drive slower.
Jane: Stop being a bitchy back seat driver.
by kiarafan April 27, 2010
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