To strike in the face.
To assault for the purpose of robbery.
To exaggerate a facial expression for communicative emphasis; to make a face, to pose, as for photographs or in a performance, in an exaggerated or affected manner.
The children weren't interested in sitting still for a serious photo; they mugged for the camera.
To photograph for identification; to take a mug shot.
To learn or review a subject as much as possible in a short time; cram.
A quick violent robbery of a person, usually in a public place.
There have been three muggings in this street in the past week.