From Longman Dictionary of Contemporary Englishmugmug1 /mʌɡ/ ●●○ noun [countable] 1 
DFUa tall cup used for drinking tea, coffee etc a coffee mug2 DFUa large glass with a handle, used especially for drinking beer a beer mug3 → mug/mugful of something4 British English spoken informalSTUPID/NOT INTELLIGENT someone who is stupid and easy to deceive Only a mug would pay that much for a meal.5 → be a mug’s game6 spoken informal a face Something scared him. Probably your ugly mug!
DFUa tall cup used for drinking tea, coffee etc a coffee mug2 DFUa large glass with a handle, used especially for drinking beer a beer mug3 → mug/mugful of something4 British English spoken informalSTUPID/NOT INTELLIGENT someone who is stupid and easy to deceive Only a mug would pay that much for a meal.5 → be a mug’s game6 spoken informal a face Something scared him. Probably your ugly mug!Examples from the Corpus
mug• She rummaged around and found a teapot and a mug.• Don't be a mug! That picture's not worth as much as that!• If you need a drink, dip a mug over the side - the water is disease-free.• I made Joanna respectable by putting up my anchor lantern, made myself a mug of cocoa, and turned in.• a mug of cocoa• She had half drained her mug when she said, ` Ah, that's better!• He's asked me to work over the weekend again - he must think I'm some kind of mug.• There were good things at school too, cooked dinners every day and milk if you took your own mug.• In another bag she had a kettle and six mugs.• Constable Jamieson came in with a steaming mug of tea and put it on the desk in front of him.• Claudia dived into her pocket, dropped the sleeping pills into the mug, stirred swiftly and rapidly switched the mugs round.ugly mug• Rubbing his cheekbones in slow circles, he winces with pain at the sight of his own ugly mug.mugmug2 ●○○ verb (mugged, mugging) 1 [transitive]SCCSTEAL to attack someone and rob them in a public place A lot of people won’t go out alone at night because they’re afraid of being mugged.► see thesaurus at attack, steal2 [intransitive] American English informalSTUPID/NOT SENSIBLE to make silly expressions with your face or behave in a silly way, especially for a photograph or in a playmug for All the kids were mugging for the camera. → mug up→ See Verb tableExamples from the Corpus
mug• He probably didn't take them out with him because he was afraid of being mugged.• More people than ever are leaving New York before they get killed, raped or mugged.• Since moving to New Jersey, he has been mugged at gunpoint twice.• Kids were mugging for the camera.• Pat Williams, D-Mont., mugged for the cameras.• She decided to move from the city after she was mugged for the third time in less than a year.• Unfortunately, it would appear that the great emergency is being mugged for your mobile.• If anyone ever tried to mug me, I would throw my bag and run.• I was scared I would get mugged or raped.• And thus does your government actually increase your chances of getting burglarized, mugged, robbed and even murdered.• To criticize him was like mugging Santa Claus.• Every New Yorker expects to be mugged sometime.Origin mug1 (1500-1600) Probably from a Scandinavian language 