Definitions
1.noun(Southern England) friend, acquaintance"Fancy a pint, me old mucker?"
2.noun(British army) A comrade; a friendly, low-ranking soldier in the same situation."Go and talk to your mucker!"
3.nounA person who removes muck (waste, debris, broken rock, etc.), especially from a mine, construction site, or stable.
4.nounA low or vulgar labourer.
5.verbTo scrape together (money, etc.) by mean labour or shifts.