Top Definition
The subway system in Sofia, Bulgaria. Opened on January 28, 1998.
He's riding in a Bulgarian subway train.
by MatToiletontotheMatToilet_17 June 20, 2016

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug
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

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug