Plumbs

• Miss Hooligan's Christmas Cake: (song) "There was plums and prunes and cherries/ And citron and raisins and cinnamon too"
  • Ritual offerings of food for the dead have been common throughout history, giving rise to early beliefs in an afterlife; the ancient Egyptians gave food to their dead in honor of the god Osiris

• Crumbs: of christmass cake, see above; by way of the P/K split and the L/R split

• plumb: (n.) a bob weight on the end of a plumbline; (v.i.) to hang vertically; to work as a plumber
  • plumber

• Johnny I Hardly Knew Ye: (song) "With your drums and guns, and guns and drums"
  • Wikipedia