When going to (or preferably crashing) a party, the Dark Brew is when one urinates into the water reservoir of the coffee maker, then places a fresh turd in the coffee basket. The offender then sets the automatic brew to go off at 6 AM (or any other suitable time).
"I just piss and shit in that fucker's coffee machine. He's in for a real Dark Brew tomorrow morning."
by Dropaduki June 16, 2009