Means Heroin and is also a famous song by Guns N Roses on their debut album "Appetite for Destruction". When they are saying "Dancing with Mr. Brownstone" it means they are "Shootin Heroin"
"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 Iris
Mr Brownstone
While having anal sex you cum inside your partners anal cavity then perform oral almost instantly sucking out your own semen only to kiss your partner to put it in their mouth.