While they went doublin their mumper all the time

• doubling all the time → while they went doublin their mumper all the time
  • A first-draft version of Finnegans wake

• doubling → Vico's cyclic view of history, in which events repeat themselves → the New World's Dublin, Georgia, is a double of the Old World's Dublin, Ireland

• Dublin
  • A Finnegans Wake Gazetteer

• Doubling all the time: motto of Laurens Co, Georgia
  • Dublin: The Emerald City by Scott Thompson p. 7: "During the first decade of the 20th century, Dublin was the third fastest growing city in Georgia. Dublin grew so fast that boosters named it "The only town in Georgia, that's doublin all the time."

• Doublin their mumper all the time - Being a mumper (a beggar) in Dublin, in reference to Giorgio, Joyce's son, who couldn't seem to become successful in life.