from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A heavy cylindrical drinking cup usually having a handle.
  • n. The amount that such a cup can hold.
  • n. Informal The human face.
  • n. Informal The area of the human mouth, chin, and jaw.
  • n. Informal A grimace.
  • n. Informal A mug shot.
  • n. A thug; a hoodlum.
  • n. Chiefly British Slang A victim or dupe.
  • transitive v. Informal To photograph (a person's face) for police files.
  • transitive v. To threaten or assault (a person) with the intent to rob: arrested the thief who mugged the tourists.
  • intransitive v. To make exaggerated facial expressions, especially for humorous effect: The partygoers mugged for the camera.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Easily fooled, gullible.
  • n. A large cup for hot liquids, usually having a handle and used without a saucer.
  • n. The face, often used deprecatingly.
  • n. A gullible, ignorant or easily-cheated person.
  • v. To assault for the purpose of robbery.
  • v. To exaggerate a facial expression for communicative emphasis; to make a face, to pose for photographs in an exaggerated or affected manner.

from the GNU version of the Collaborative International Dictionary of English

  • n. A kind of ceramic or metal drinking cup, with a handle, -- usually cylindrical and without a lip.
  • n. The face or mouth; ; -- often used contemptuously.
  • transitive v. To take property from (a person) in a public place by threatening or committing violence on the person who is robbed; to rob, especially to rob by use of a weapon such as a knife or gun.

from The Century Dictionary and Cyclopedia

  • To distort the face; make grimaces.
  • To cram for an examination.
  • n. A. fog; a mist.
  • n. A small cylindrical drinking-vessel, commonly with a handle; a small jug.
  • n. The contents of a mug; as much as a mug will hold: as, a mug of milk and water.
  • n. The mouth or face.
  • n. A. grimace.
  • n. Same as green gram (which see, under gram).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)
  • n. a person who is gullible and easy to take advantage of
  • n. with handle and usually cylindrical
  • n. the quantity that can be held in a mug
  • v. rob at gunpoint or with the threat of violence


from The American Heritage® Dictionary of the English Language, 4th Edition

Perhaps of Scandinavian origin.
Probably from mug1 (possibly in allusion to mugs decorated with grotesque faces).

from Wiktionary, Creative Commons Attribution/Share-Alike License

This definition is lacking an etymology or has an incomplete etymology. You can help Wiktionary by giving it a proper etymology.



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  • You're such a mug.

    (That's not slang for something, I'm just literally calling you a coffee mug.)

    March 5, 2018