Definition of "Mug" :
noun: with handle and usually cylindrical
noun: the human face (kisser' and smiler' and mug' are informal terms for face' and phiz' is British)
noun: a person who is gullible and easy to take advantage of
noun: the quantity that can be held in a mug
verb: rob at gunpoint or with the threat of violence
"I was mugged in the streets of New York last night."