Top definition
An interesting proposistion.
Where might I find this BST that I have heard so much about?
by Chris G: Unibrowed P-I-M-P January 12, 2005
Get the mug
Get a Butt Sex Train mug for your coworker Manafort.
2
"Grant and Forrest are the masters of the Butt Sex Train, known casually as BST"
by Boots April 25, 2004
Get the mug
Get a Butt Sex Train mug for your grandma Sarah.