mug - definition of mug by The Free Dictionary
mug 1 (mŭg) n. 1. A heavy cylindrical drinking cup usually having a handle. 2. The amount that such a cup can hold. [Perhaps of Scandinavian origin.] mug 2 (mŭg) n. 1. Informal a. The human face. b. The area of the human mouth, chin, and jaw. c. A grimace...