(UK, slang, Southern England, Northern Ireland) Friend, acquaintance.
Fancy a pint, me old mucker?
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(slang, British Army) A comrade; a friendly, low-ranking soldier in the same situation.
Go and talk to your mucker!
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A person who removes muck (waste, debris, broken rock, etc.), especially from a mine, construction site, or stable.
Too fucking late, son. I didn't want my mucker blown into tiny bits.
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