Usually coffee, but could be any beverage with a brown color. Typically one uses the term in the context of an unsavory environment such as work, church, or 12-step meetings.
Guy 1: 'Hey man, lets take a break at 4pm and get some brown drank'
Guy 2: 'Ok'
codeine/promethazine cough syrup mixed in with some sprite. serve it up in a white styrafoam cup with some ice and your good to go. you can mix it up with all kinds of sodas or just sip the ish. there is NO alcohol in it and its NOT robitussin. It's thick and purple and comes only by prescription or by your local weedman. not to be sipped by suckas!!!!!
Term used to describe "Evil Eye Sour Green Apple" drink. Sold in 40's for the classiest look and may be disguised in a brown paper bag. Helps cheap folks stay classy, gives wonderful gut rot, and aids in the making of good decisions.
Being much too cheap to buy beer, yet still yearning to be sloppy drunk, Jake purchased Green Drank.