A dog that has been trained to have sex with humans.featured in some kinds of porn and sometimes brought to an orgy as a curosity or to make it more kinky or as a pet for a pervert ect.
Guss what John's got one of those sex trained dogs.
by Deep blue 2012 December 1, 2009
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"Grant and Forrest are the masters of the Butt Sex Train, known casually as BST"
by Boots April 26, 2004
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