A disposable plastic drink cup with some water in it used by cigarette smokers as a makeshift ashtray. After a while; it becomes filled with so many used cigarette butts, the contents of it look like muddy tobacco sludge.
At Mike's party; I reached over for my beer cup. Since I was drunk, I didn't realize I was about to take a swig from the Mud Cup. Thank God someone stopped me before I chugged the whole damn thing.
by Dr. Claw March 12, 2010