Dictionary

A large cup for hot liquids, usually having a handle and used without a saucer.

The face, often used deprecatingly.

Example: What an ugly mug.

A gullible or easily-cheated person.

Example: He's a gullible mug – he believed her again.

A stupid or contemptible person.

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.

Example: 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.

Easily fooled, gullible.

Motherfucker (usually in similes, e.g. "like a mug" or "as a mug")