The train you and a few mates get on when you're going for a messy journey through space and time. Also known as the K Hole train.
Jake: I wanna go on the messy train
Ross: Yeah, Lets make some lines
2 fat lines are made and snorted.
Jake: Beaut
Ross: Yeahhhh
The action of taking a shat on a mans penis weather it be accidental or on purpose
"she gave me a Messy Dior during anal last night."
"did you see him, he totally got a Messy Dior."