Back Seat Syndrome 

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.

Back Seat Syndrome by Lord Azaldon April 18, 2013

Front seat, Back seat syndrome 

A rare condition in which one cannot decide which seat to take, even though only one actual seat is available. This is generally caused by a mental defect of some sort.

Eric: I cant decide which seat i should take on the bus sometimes. I think I may have Front seat, Back seat syndrome.

Front seat, Back seat syndrome by Jim Sominsummthin July 20, 2011