mug Meaning, Definition & Usage

  1. noun the quantity that can be held in a mug
    mugful.
  2. noun a person who is gullible and easy to take advantage of
    fool; soft touch; sucker; gull; patsy; fall guy; chump; mark.
  3. noun the human face (`kisser' and `smiler' and `mug' are informal terms for `face' and `phiz' is British)
    smiler; physiognomy; visage; kisser; countenance; phiz.
  4. noun with handle and usually cylindrical
  5. verb rob at gunpoint or with the threat of violence
    • I was mugged in the streets of New York last night

WordNet

Mug noun
Etymology
Cf. Ir. mugam a mug, mucog a cup.
Definitions
  1. A kind of earthen or metal drinking cup, with a handle, -- usually cylindrical and without a lip.
  2. The face or mouth. Slang Thackeray.

Webster 1913