spoiled, sulky, sullen. Having a tantrum, being difficult.
Was widely used in the Manchester area.
Always assumed it's a corruption of "marred" (or "mar'd" or "marr'd" as Shakespeare wrote it). See also mardy, mardarse and mardy-pants. Compare with nesh.
Don't be so mard, our Bill- just eat it.
He's being a bit mard today.
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