Top Definition
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.
#cigarettes #ashtray #cup #sludge #beer
by Dr. Claw March 12, 2010
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