Dancing with Mr.Brownstone refers to doing Heroin. There is also a song about this by an American Rock group known as Guns N Roses.
We've been dancing with Mr Brownstone he won't leave me alone drugs heroin guns n roses rock america Dea
by Kervy May 1, 2015
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guns n roses slang for doing heroin

...HEROIN SHOOTAGE BIOTCH
"hey, where have you been?"
"slam-dancing with mr. brownstone in the 7/8 bathroom"
"yeeah man! damn, share the goods i need a fix"
by geebongee June 21, 2006
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