When either a man or a woman squats over the ass of another and shits on said ass and then proceeds to push the fresh shit into the others ass. After completing this task, the receiver then gets up and shits their feces and the feces of the shitter into the shitter's mouth.
Me and Nik were out in the back and he gave me the worst gravy train.
by L Sizzle January 23, 2008
A line of guys who enjoy the company of other men. A sort of leap frog of sex if you will. The man in the back is the pitcher and the person directly in front of him is the catcher... he is also a pitcher for the guy in front of him. The men alternate from a standing to bent position engaging is homosexual activity.
I walked into your dads room and saw him in the middle of the gravy trian smiling and laughing.
by UT fuckers February 14, 2005