noun

1. a heavy drinking cup of earthenware or metal, having a handle and formerly often ornamented with a human face
2. as much as a mug will hold
3. Slang
   1. the face
   2. the mouth
   3. a grimace
   4. a rough, ugly person; ruffian, thug, etc.
   5. ☆ mug shot

Etymology: prob. < Scand, as in Swed mugg

transitive verb mugged, mugging mug′·ging

1. to assault usually with intent to rob
2. ☆ Slang to photograph; esp., to photograph (a person under arrest) for police records

intransitive verb

1. to assault a person, usually with intent to rob
2. Slang
   1. to make a grimace
   2. Theater to overact by exaggerated facial expressions