A roller coaster ride in which two or more people are riding in a car and out of nowhere it starts smelling like the most foul, vile shit you can imagine. At this point, passengers on The Shit Train are allowed to roll down their windows for fresh air or to vomit. Yes, some passengers on The Shit Train may need a barf bag to ride.
I made my friend ride The Shit Train three times on the way home from school!
by Bignos January 13, 2010

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