Webster's English Dictionary

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mug

1. mug \'m*g\ n [origin unknown] 1: a usu. metal or earthenware cylindrical 
   drinking cup  2a: the face or mouth of a person  2b: GRIMACE  2c: a 
   photograph of a suspect's face  3: PUNK, THUG 
2. mug vb or mugged;  or mug.ging : to make faces esp. to attract the 
   attention of an audience  : PHOTOGRAPH 
3. mug vb or mugged;  or mug.ging [back-formation fr. 2mugger] : to assault 
   esp. by garroting usu. with intent to rob