Australia, 1938—an indignant response to someone who is taking the speaker for a fool—alludes to the condescending way in which townspeople treated people from the country during bush week (i.e., a festival held in a town or city, celebrating bush produce, activities, etc.)
U.S. slang, 1935—a photograph of a person’s face, especially in police or other official records—from ‘mug’ (a person’s face) and ‘shot’ (a single photographic exposure)
something that enables a person to evade punishment, adverse consequences or an undesirable situation—refers to a card in the game of Monopoly which allows a player to leave the jail square
1691—to expose the flaws in something such as a law, a policy, an argument or a belief—these flaws are likened to holes large enough to drive a coach and horses through them
a person or thing, initially ugly or unpromising, that changes into something beautiful or admirable—New Zealand, 1848—from Hans Christian Andersen’s story about a supposed ugly duckling that turns out to be a swan
also ‘mustang court’ and ‘kangaroo inquest’—USA, 1840—a mock court that disregards or parodies existing principles of law; any tribunal in which judgment is rendered arbitrarily or unfairly