1) A song by the Arctic Monkeys, who are a band from Sheffield, UK. The song is about the lead-singer's ex-girlfriend.
2) A fansite dedicated to the above band - www.mardy-bum.com
3) A collection of mardy and bum, someone who moans when they don't get their own way and yet don't do anything for themselves.
She's a right mardy bum!
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