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
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Sexual practice that involves S&M acts whilst hanging from your nipples. Its name derived from the fact that your nipples become flattened and discolored like Bulgarian traffic cones.

Note: NOT for novices or those with pre-existing nipple conditions!
by CSoundtrack March 9, 2012
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The act of excreting waste into another beings sneaker or other various footwear.
Travis: yo Hudson, did you Bulgarian Hot-potato sean's sneakers again?!

Hudson: Totally brah i Bulgarian hot potato errbody, and their grandma!!
by MrSovietMudkip August 4, 2011
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An explosive made from nuclear waste that is shockinly easy to obtain from the black market in the Eastern-European country of Bulgaria.

This is made possible due to the complete lack of regulation of the pro-capitalist business system in Bulgaria that allows the black market to thrive there, and other countries with similar policies.

And, in my personal opinion, I'm surprised that the international community isn't up in arms over this.
A terrorist goes to Bulgaria, and with the help of a black market specialist, was able to obtain a nuclear warhead and nuclear waste that was smuggled out of the Russian Federation and was able to leave Bulgaria with the newly-acquired Bulgarian Dirty Bomb.
by TheFalloutGhoul December 11, 2012
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First diahrea is a necessity. Then starting a rolling brown out on a male or female, then you partner slowly stands up as the feces come out of the rectum. Thus causing the other person to be covered in a web of feces looking like a swamp monster.
Guy1: "Dude last night she totally blew me at the party last night"

Guy2: "... well my girl got so wasted she couldnt control her bowels and made me look like a bulgarian swamp monster"
by little nippy hawk panther October 21, 2011
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