mug

be a mug's game

To be a task or activity that is foolish, dangerous, or will not result in a positive outcome. Primarily heard in UK. Allowing your children to play with fireworks is a mug's game. They are bound to get injured.
See also: game

mug it up

To make silly or exaggerated facial expressions, especially when being filmed or photographed. I wish you wouldn't mug it up like that every single time I try to take your picture. I just want one photo where everyone is smiling nicely! She really stole the show, mugging it up for the camera in every scene she was in.
See also: mug, up

mug off

1. slang To treat someone like or make someone seem like a fool. You're just mugging me off now! They're just kids trying to mug you off. Don't pay them no mind.
2. slang To treat someone in a disrespectful or contemptuous manner. She claims the other contestant mugged her off in front of her teammates as a means of creating drama and tension within the show. It just feels like the band is mugging their fans off, charging so much for a concert ticket and then giving such a horrible performance like that.
3. slang To cheat, swindle, or con someone. I had a feeling the solicitor was mugging us off. Over 10,000 customers have been mugged off by the fraudulent investment firm.
See also: mug, off

mug shot

1. An official photograph taken of someone being brought into police custody, usually characterized by the person wearing a grim or blank expression on their face. The celebrity's unflattering mug shot quickly spread across the Internet overnight following his DUI arrest. I actually managed to make a really goofy face while the cops took my mug shot, which pissed them off to no end.
2. Any portrait or photograph that resembles such a picture. I hate getting my mug shot taken at the DMV for my license—I always look terrible! Wow, nice mug shot! Couldn't smile for the camera, could you?
See also: mug, shot

mug up

1. To study through intense rote memorization. Primarily heard in UK. The professor always tells his students not to mug up ahead of exams. I mugged up my whole way through college, but now I can hardly remember anything I learned.
2. To memorize something. In this usage, a noun or pronoun can be used between "mug" and "up." Primarily heard in UK. We all mugged the lines up and recited them like parrots, without ever really thinking about what they meant. I'd rather help my students learn how the language is actually used, rather than pressuring them to mug up the precise grammatical rules and terms.
See also: mug, up

mug's game

A task or activity that is foolish, dangerous, or will not result in a positive outcome. Primarily heard in UK. Allowing your children to play with fireworks is a mug's game. They are bound to get injured.
See also: game
Farlex Dictionary of Idioms.

a mug's game

an activity which it is stupid to engage in because it is likely to be unsuccessful or dangerous. informal
Mug was mid 19th-century slang for a fool, in particular someone who has been duped by a card sharper or criminal. Mug's game appeared in the early 20th century and has been applied to a wide variety of activities, especially horse racing and betting on horses.
1992 Economist From the way many western businessmen talk, you would think investing in eastern Germany was a mug's game.
See also: game
Farlex Partner Idioms Dictionary

be a ˈmug’s game

(disapproving, especially British English) an activity which brings little or no benefit to you: Don’t start smoking — it’s a mug’s game. The money’s terrible in this job — it’s a real mug’s game.
Mug here means ‘fool’.
See also: game
Farlex Partner Idioms Dictionary

mug

1. n. the face. (Crude.) Wipe that smile off your mug!
2. n. a thug; a goon. (Underworld.) Call off your mugs. I’ll come peacefully.
3. tv. to attack and rob someone. Somebody jumped out of an alley and tried to mug me.

mug shot

n. a photograph of one’s face taken for police records. (Underworld.) I’m going to have to ask you to come down to the station and go through some mug shots.
See also: mug, shot
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • a mug's game
  • be a mug's game
  • balls on about (something)
  • bang on about (something)
  • bang away about (something)
  • a fool and his money are soon parted
  • fool and his money are soon parted
  • fool and his money are soon parted, a
  • parted
  • (as) silly as a wheel
References in periodicals archive
Stations have held contests for the most distinctive and artistic Design A Mug and featured the product at local media events.
Ceramic mugs will be available for purchase this fall for $10 at various downtown locations.
Available in two flavors-caramel and chocolate-Maya's Happy Mug comes, as its name implies, in its own mug.
But it was the 'I like big mugs and I cannot lie' mug that sold out first - in just 10 MINUTES.
Hilarious reason useless Brexit mug has 'tapped into the national psyche'
Lee, of Bentham Pottery in Ingleton, Yorkshire, posted a picture of the mug on Facebook with the words: "Limited edition commemorative Brexit mug available from 29th March 2019."
EVERY year the Manchester Christmas Markets come up with brand new limitededition designs for their mugs, and this year's have finally been revealed.
"When I was a student in the interior design field, I realized how good designs have an affect on our lives; they affect everything around us, even the small products we use daily like mugs.
Jamber has taken the standard, archaic coffee mug design and reinvented it with bioengineering and 3D printing.
Each box consists of four individual portion Mug Cakes.
Then with that raw, intimate mug shot, the Godfather of Soul was brought down to earth.
In simpler words, Bertillon was the developer of the mug shot technique, used to this day, for keeping a record of a convict's physical identification.
Meghan Markle and Prince Harry's wedding is scheduled for May 19, but before then, commemorative mugs and other souvenir items are already being sold in Windsor.
Mumbai, India, February 21, 2018 --(PR.com)-- EZ Life is excited to introduce two new additions to its Double Wall Glass collection - Double Wall Glass Galaxy Mug and Double Wall Swag Glass with Bamboo Lid.
SHALL continue to use my Town mug for tea after their crucial Sunday win over Bournemouth.