Mardy
Mardy is a northern and Midlands English word for sulky, moody or easily upset, as in "don't be mardy". A "mardy bum" is someone in a bad mood or who complains a lot; the phrase became widely known through a 2006 Arctic Monkeys song from nearby Sheffield.
In practice
The word is used about children who sulk, adults who take offence, and even weather or machines that will not cooperate. It is gently teasing rather than harsh: telling a friend "you're being mardy" is a way of telling them to cheer up. You will hear it across Yorkshire, Lancashire and the East Midlands.
Why it matters to newcomers
If a colleague calls the printer mardy, they mean it is playing up. If someone says you look mardy, they think you are fed up. It is an everyday word and fine to use once you have heard it a few times.
Related
- Ey up - the cheerful opposite
- Nowt and owt - more Yorkshire everyday speech
Source: Wiktionary: mardy.