mug /mʌɡ/noun 8verb 5adjective 1forms 6phrases 3 noun8 •a large cup with a handle, used for hot drinks such as tea or coffee •(slang) The face.[…] 'let him go, I tell you, or I'll be after breaking your ugly mug,' and with that I gave him a dig that knocked him into smithereens. — 1836 •(slang, disapproving) A gullible or easily cheated person.He's a gullible mug – he believed her again. •(slang, offensive) A stupid or contemptible person. •(slang) A mug shot. •(slang) The mouth.Shut your mug! •(slang) A criminal. •(slang, euphemistic) Motherfucker (usually in similes, e.g. "like a mug" or "as a mug") verb5 •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 of. •(UK, slang) To learn or review a subject as much as possible in a short time; cram. •(UK, no longer used) To strike in the face.Madgbury showed game, drove Abbot in a corner, but got well Mugg'd. — 1821 adjective1 •(slang) Uninteresting or unpleasant.But anyways, I stayed back a second year and my papa was visiting when momma was opening de report card. Papa gave me de muggest moment in my life like. — 2013 formsmugged · mugging · mugs · Mugs · mugger · muggest Phrases with mug mean-mugTo shoot a dirty look at (someone); to express hostility or menace towards (someone) through a dirty look. mug offTo cheat, swindle, dupe (someone). mug upTo study intensely.