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.
by Dr. Claw March 12, 2010
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug