A sex move when the two partners connect bum cheeks and then proceed to defecate into each others anus; if only one person defecates then it is called the Subway train, although if both partners decide to poo, then it is the Subway train collision.
Man 1: So how was the girl last night?
Man 2: Oh god no, she has a scat fetish; she wanted to subway train me!
Man 2: Oh god no, she has a scat fetish; she wanted to subway train me!
by SubwayTrainn May 1, 2010
He's riding in a Bulgarian subway train.
by TidePodIngebrigtsen69 June 20, 2016
When one sexual partner connects the rectum hole with another, and either one eject's feces into the other's rectum. The other partner, who has received the feces, will excrete it back into the partners, along with her own. This will happen back and forth, making the Bulgarian Subway Train
The Bulgarian Subway Train was very gross, so said the viewers. They also listen it as being 'vile' .
by Hamachis October 23, 2010
by Dizzlenuts December 24, 2017