Bulgarian subway train 

The subway system in Sofia, Bulgaria. Opened on January 28, 1998.

He's riding in a Bulgarian subway train.

Bulgarian subway train by TidePodIngebrigtsen69 June 20, 2016

Bulgarian Subway Train 

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' .

Bulgarian Subway Train by Hamachis October 24, 2010