A dialect word originating from Derby and Sheffield
a) Adjective used to describe a moody or grumpy person
b) Can also be used as 'mard' as a noun to describe someone who is currently in a mood
c) Someone who is reguarly mardy can be described as a mardy bum or mardy arse
"Lucy had a go at me for nothing today. She's so mardy at the moment!"
"Tom's in a mard with me because I called his mum a slag"
"Jenny never stops complaining - she's such a mardy bum!"
A local nickname for Sheffield, originating from it's long history of steel manufacture. Mainly used by locals when asked where they live.
Person 1: So where are you from?
Person 2: Woo! Steel city!