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
1 more definition
1 Word related to Butt Sex Train
See BST.
"Grant and Forrest are the masters of the Butt Sex Train, known casually as BST"
by Boots April 25, 2004

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